There's no such thing as "an assault knife". A knife is a knife. And lots of hard working men(a man lady such as yourself wouldn't know) need something sharp and that isn't cumbersome to complete there jobs and pocket knives fit the criteria.
You never know when you'll need to cut something, but still, things are always needing to be cut.
Also, if those other people carried knives then they could have protected themselves.
Knife control, just like gun control, will not stop those planning to break the law using those weapons.
And what more can we even do about it? There are already knife laws in place.
On the weekends, around 1am, I sneak into the local hospital's morgue and try to bring life back into the corpses using, firstly, CPR, then after defibrillating my dick( because I have erectile dysfunction), I try defibrillating the corpses, then of course, witchcraft.