This is exactly what they seriously are doing over in England, knife bans and such. They outlawed guns but knife crime went up staggering amounts.
When will they ban baseball bats?
I once had a knife confiscated in the Jerusalem Central Bus Terminal. It was in my suitcase, a Tanto knife I bought from my sensei when he had to close his dojo. Funny enough, there was a knife store right upstairs in the terminal, where I could have bought something not quite as good but comparable. But the knife showed up on the x-ray machine so they confiscated it, made me authorize its destruction, and the officer then probably sold it.
Not to mention intoxication crimes.