That assumption is not remotely fair, and you basically admitted that your solution is bollocks anyway: "just keep banning implements until citizens have nothing left to kill each other with, and don't ever address why they want to kill each other in the first place... because that's hard, banning stuff is easy."

I'll put it this way: I hate football, and I hate football hooliganism even more. Should we ban football to stop football hooliganism, or should we figure out the underlying reason that football fans are so truculent?