the knife doesn't actually get pointed at your own body, that's just a trick of perspective in the photo. The knife should actually be roughly parallel to the plane of your chest. It stabs in to the throat, behind the carotid and larynx, and then is ripped forward and out.They are not whopping great big germans with a heap of mass between the knife and yourself.
I have friends who researched in to it.
A statistic that I found interesting is the correlation between population/housing density and gun vs. knife. Statistically, in Less populated/housed areas, knives are used about 30% more than guns.People still fight with knives. people still get stabbed with knives. Depending on where your live, there may be more or less of it happening.