Let's just take some examples. What about interment camps during WW2, deporting communist supporters shortly after, racial segregation, performing human subject experiments on black people and biological weapons research on the public without consent, and much higher abuse of power or corruption in politics and in policing. Which freedoms existed then that don't exist today?
There's no denying your examples but here we are discussing war. In times of war the normal order of things and ethics fall apart no matter which side one's on. During war, people are very scared and they act outside the box, they do strange things they'd never do in peace time. When I was conscripted I was not only furious but also shit-scared that I might be killed in an unethical war that my side should never have been involved† in (why die in the name of a wrongful cause?).
If you've never been in that situation then you would never know what it's like. (You may think you can imagine the situation but when you actually experience it you know damn-well your initial thoughts were wrong and way off the mark.)
Some of those matters to which you've referred are of my generation and right they're unforgivable by any standard, but again that was the time of the Cold War—and people acted as if there had been an actual war in progress. I know, I can never forget the Cuban Missile Crisis in October 1962 and how people reacted, for thirteen horrific days days we wondered if we'd live until the next morning. Again, people act very strangely in such circumstances.
Did you actually live through the 1950s and 60s? I did, so I speak from actual experience.
"…and much higher abuse of power or corruption in politics and in policing."
How you can say that just beats me given the unmitigated mess that politics and governance is in today (and I'm not only referring to US politics, democracy is in real trouble everywhere). If I were blogging on my own website I'd ask you to provide solid references to back your assertions—ones that can be authenticated.
Moreover, how do you know what abuses of power are taking place today if they're hidden? Of which jurisdictions today are you certain that are free of human rights abuses, if any? Do you actually believe what you read in the media and or on social media? Where do you get your verifiable facts from?
"Which freedoms existed then that don't exist today?"
There are many—actual and implied. I'll steer mainly away from legislated matters because that would require more than just a paper but a whole book, and even then it'd fall short. Let me just say that despite the fear of the Cold War and nuclear armageddon, when I was a child and later as a teenager we kids had a much more carefree existence than today's kids—and that's important for mental health. Here are a few freedoms that don't exist today (there are many more):
• There was no drug problem, we were free of that dreaded vice. We kids were never offered drugs, in fact most of us wouldn't have known the names of them (moreover, many designer drugs had not been invented then). Cleary, none of us died from overdoses.
• Kids were free to roam without fear, we ranged and did what we wanted without question from parents (except to take advice to take care). We played without parental supervision (unfortunately today that childhood right (freedom) has been lost to childhood).
• Kids were not wrapped in cocooned protection as they are today. We walked to and from school without our parents although sometimes we caught the bus. (I walked home from school by myself from age six onward and that involved crossing a busy main arterial road). If parents had picked me up I'd have be hounded as a sissy. It was just not done—that's why we kids developed a much stronger resilience to life's knocks than kids of today (there's substantial evidence for that).
• The term 'helicopter parenting' had not been invented, and kids would not have stood for it (if a parent were to so act people would have thought such action as peculiar). Today, helicopter parenting is ruining many kids' lives.
• Many kids today are so protected and mollycoddled that they are actually frightened to leave the house. If a kid is sacred just to leave the house then it's a freedom lost! When I first heard of this I thought this must have been a gross exaggeration but in fact it's a real problem nowadays. If there were such cases when I was a kid then they would have only applied to very few kids with severe mental problems. What I am saying is that back then that actual instances must have been so rare that the notion of a child being scared to leave the home just wasn't in the public's consciousness.
Now take today's situation. If nowadays parents are so frightened of the outside world then something has happened to make them so act. Whatever the reason, valid or imaginary, there's something wrong with today's society that was OK when I was a kid. Arguing the contrary would simply be a fallacy—a non sequitur.
• Teenage suicide likely happened when I was a kid but it would have been such a rare event that none of us had ever heard if it, again it was not a notion of public importance as it is today. As kids, the notion of suicide never encompassed our thoughts. Kids today are aware of it and some mull over the possibly—we were free of such destructive thoughts.
• No one had ever heard of school shootings, it was so far off the radar that no one would have thought of the notion. School was a place that no kid feared (other than those few who dreaded school for the more usual anti-school reasons).
• Mass shootings were almost unheard of, especially so outside the US.
• Government interference in and intrusion into the lives of ordinary citizens was only a fraction of what it is today, no mass spying etc. Sure, the Cold War wrongly targeted mostly innocent groups (but again a wartime mentality was alive and at work here). That said, the US was gripped by fear far more than any other country with ratbags like Eugene McCarthy fuelling the flames. Otherwise, people in most other Western countries were spared from such human rights indignities and violations.
And that's just for starters. Have things gotten better? No doubt some things have, and no doubt some are definitely worse. And some are just the same—war is just as ugly as it's ever been, perhaps even worse with weapons targeted on civilians (certainty so at any other time since WWII). Witness the current Ukraine, Palestinian and other running conflicts—clearly, things are the worst they've been in many decades.
Am I biased? Yes, everyone is to some extent, but my political science and philosophy training taught me to at least look at the facts objectively.
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† I am of the firm opinion that to invade another country without, say, imminent annihilation is the gravest and most egregious action that any country can take. To defend one's country from unprovoked invasion is another matter, but even then one's defense must be measured and appropriate. Defending one's country out of sheer patriotism and bravado alone doesn't make sense. As Wilfred Owen said "Dulce et decorum est pro patria mori" is a lie and I agree wholeheartedly. No, I'm not a pacifist, just a realist.