Problem is that there's a difference between trying to fix a weapon-dependent system and creating a new one without any weapons. That's why it's impossible to remove all weapons in the US in one swoop, it can and will never be done.
On the other hand introducing weapons into a society that has never had access to them would never work either. Everyone I know feel safer without a weapon in their home than they would having one.
And yes, I realize that a kitchen knife is a dangerous weapon, but so is a toothbrush according to many prisons