Not condoning it, but stating the obvious:
This is the information age:
You Can't Stop The Signal.
Bans of physical things will not stop determined, well financed groups, (or even intelligent, but crazy individuals) from committing mayhem ..... and you can't kill an idea if there are heads that harbor and can communicate it. Laws, even harshly enforced laws, won't do it: If it were possible to make a completely safe Police State, then prisons would be the very safest of places. They among the most violent places on earth.
You must win in the marketplace of ideas, and make mayhem unpalatable, unprofitable, and unacceptable.
Likewise, in a free society, there are going to be risks ..... that's the price of Liberty.
TheGolden Rule of Tool Use: "If you don't know what you are doing, DON'T."