The statistics already show that such bans or regulation can work. Anecdote is just anecdote, nothing more.
Who exactly do you think these kids are doing these crimes? They aren't trained military personnel or something- for them killing with a knife is tremendously harder than killing with a gun. But you seem to think it is the same thing- so where do you draw the boundary? Why don't we legalize the ownership of military-grade bombs and grenades if weapons can't make it easier? Or at that margin do you agree with me that certain weapons do make it easier?
Who exactly do you think these kids are doing these crimes? They aren't trained military personnel or something- for them killing with a knife is tremendously harder than killing with a gun. But you seem to think it is the same thing- so where do you draw the boundary? Why don't we legalize the ownership of military-grade bombs and grenades if weapons can't make it easier? Or at that margin do you agree with me that certain weapons do make it easier?