Does everything have to rise to a national security threat in order to be undesirable, or is it ok with you if people see some externalities that are maybe not great for society?
I think the free access to that information in those cases is an exacerbating factor that is easy to control. That’s really not as complicated as you want to pretend it is.
I agree that the principles are not complicated, though.
Do you advocate 'not restricting' murder? I assume not, which means you recognize that there's some point where your personal freedom intersects with someone else's freedom - you've simply decided that the line for 'information' should be "I can have all of it, always, no matter how much harm is caused, because I don't care about the harm or the harm doesn't affect me directly and thus doesn't matter. Thoughts and prayers."
You would have a point if your vision for a self regulating society included easily accessible mental healthcare, a great education system and economic safety nets.
But the “guns kill people” crowd generally rather sees the world burn.
I am begging you to learn what “per-capita” means, and to not deceptively include self-inflicted deaths in your public-safety arguments: https://en.wikipedia.org/wiki/List_of_countries_by_firearm-r...
https://en.wikipedia.org/wiki/List_of_countries_by_firearm-r...
"Again, when a man in violation of the law harms another (otherwise than in retaliation) voluntarily, he acts unjustly, and a voluntary agent is one who knows both the person he is affecting by his action and the instrument he is using; and he who through anger voluntarily stabs himself does this contrary to the right rule of life, and this the law does not allow; therefore he is acting unjustly. But towards whom? Surely towards the state, not towards himself. For he suffers voluntarily, but no one is voluntarily treated unjustly. This is also the reason why the state punishes; a certain loss of civil rights attaches to the man who destroys himself, on the ground that he is treating the state unjustly."
— Aristotle, Nicomachean Ethics Book Ⅴ http://classics.mit.edu/Aristotle/nicomachaen.5.v.html
And equating speech with guns is going to tie you up in some intellectual knots.