The knifes in my kitchen only I have access to and I know I'm not going to behead anyone. However I live by my principles and I have no problems with banning knives in public, or vendors securing them. (which is relatively common around the world btw, see Japan, UK, much of Europe etc..)
I worked for Samsung. Some guys in Korea got into heated discussion and carved each other with kitchen knives available in the office. Guess what, no kitchen knives other than plastic.
Here in Poland people just started bringing their own EDC knives.