Physical hardware can be controlled, yes. Decentralization and obfuscation similar to TOR is probably needed here.
> if they say no to your forgetting to scan the case of water on the bottom of your cart, you're going nowhere.
> if they say no to your hacked cable box, you're going nowhere.
> if they say no to your speeding, you're going nowhere.
> if they say no to your weed, you're going nowhere.
> if they say no to your growing a mushroom and mailing it to your friend, you're going nowhere.
There's a whole spectrum of how illegal something is to consider. People break the law every day for a range of reasons from accident, to ignorance, to convenience, to want, to need, etc.
If people all started talking through letter mail, you'd get Letter Control, they wouldn't just forget about it because it's not the internet. If the people somehow become smart and coordinated enough to move to some cryptographically-secure method of communication, your government will probably outlaw the equipment and actions associated with using it in the first place instead of trying to decrypt all communications.
The goal is control of information, and the way of doing that is to force everyone to use unsecured communication with no feasible alternatives. I wouldn't expect kid glove treatment with that, unlike speeding or minor shoplifting.
It is the same as free speech. You can say what you want, but you can go to jail for saying the wrong thing in many countries.
Shooting someone is also "just physics", yet many governments have been known to frown upon it (depending on the context).
