Like the guy in Phoenix a few years ago that put his 2 or 3
year old daughter in the car told her they were going to look
at X-mas lights. Instead he stopped on a stretch of road,
poured gasoline on her and set her afire, then drove off.
Granted that is an extreme example, but this is the kind of
behavior you sometimes run into. The rack of a pump shotgun
would have little or no effect on that dude.

Well, after the "schlack-schlack!" there's always Plan B......