Because porn is the most taboo things in public, even if a lot of people use it at home. Nobody will come and defend liberal porn access because then everyone will call you a gooner or a pedo. It'll probably be the end of your political debate.
Which means porn access can be weaponized without any political opposition. It's the perfect scapegoat to remove online anonymity disguised as "age verification".
I did catch my son watching porn when he was 13. We talked about it, I blocked some stuff at my router (hardly comprehensive, but mostly to make it easy to avoid the thing he was watching), and then stopped worrying about it. He's 17 now. I'm sure he knows how to find it if he wants it, but I also trust he's able to interpret it responsibly. He seems like a well-adjusted kid. I worry more about his gaming addiction, but it doesn't seem to be interfering with school anymore.
re: gaming addiction - my parents were obsessed with me being "addicted". Now, as an adult, I don't care about games anymore. Everything I have I owe to computer skills and English. What my parents didn't want to see (or couldn't?) was that at the time games were the only interesting thing to do. We were glued to the screens mostly because everything else sucked.
It's a cultural thing
