they've probably killed 2 kinds
1. the suppressed version kills lots of important people
2. the normal kind kills lots of dumbasses who accidentally shoot themselves.
the caliber that kills the most people in the US every year is the .22LR cartraige.
and most of the time it's cause peopel keep their finger on the trigger, or point it at their friends like it's an airsoft gun.
and no, the .22 handguns are not as whimpy as airsoft guns, that being said, they're not much more hard kicking than airsoft guns.