Wow so much to say, some great points made by lots of wise people. Too stabman taking the higher road by trying to have a constructive dialogue while admirable doesn't work the antis among us have grown too large and too powerful. Besides those who oppose knives don't care how nice, respectful and reasonable you are or appear, their views can not and will not be changed. By and large these individuals are operating off of pure emotion with the main one being fear. Fear is a very powerful emotion which can destroy whatever is its path with reckless abandon and utter ruthlessness.
Combine this with the mind boggling ignorance of the masses today, tv, social media, speacial interest groups, political whores, lobbyist , LAWYERS, etc., and the fact that everyday I meet fewer and fewer people who are capable of analytical thought, critical thinking and deductive reasoning. Were screwed sorry.
The knife issue like the gun issue are both just microcosms based on the same underlying serious problems that have our nation in a cold civil war right now. So not to be a downer but when you look at your question from a macro perspective the awnser is profoundly disturbing. We have to reboot entire generations of people across multiple levels. Is it possible yep anything is possible but the real question is it probable, absolutely not.
One thing I need to mention. We have huge portions of entire generations of bots across all races being raised only by women. Daddy is an unknown or MIA or, well you get the point. A lot of these problems with fear and misconception begin at home. If there is no daddy there to teach the boy how to be a man, well just take a look around.
Sorry for being long winded but the op asked asked a seemingly easy straight forward question, that in reality was a very complex multiple layered issue with no easy straight forward awnser.