good point... but, just to play devil's advocate, i have not seen in the news a story about someone stabbing 14 children to death in a public school, before he got stopped.
to eliminate all evil, is a goal that cannot be achieved, but we should simply try our best to mitigate its effects..
your quite right of course , what would people rather have a gun or a knife in defending themselves , I think everyone would say gun, also it is quite easy for me now just to go shops after writing this at go to a supermarket and buy a knife , not so easy to get a gun. I f people want to arm themselves that is fine .