[jvergeldedios]

They're designed to prevent going straight through by expanding inside of soft tissues. One of the effects of that is increased tissue damage. So they maybe they weren't "designed to cause maximum harm" but that's certainly one of the effects over a full metal jacket round.

[Casseres]

Yes, designed to expand in order to stop, not designed to expand in order to harm.

I do feel for the teacher; the situation is not ideal and I wouldn't want to have to shoot someone I'm supposed to take care of either.

I think it's good that this teacher sounds like someone who doesn't want to use his gun (not "trigger-happy"), I just hope in the unlikely situation where he would have to use it, that quality doesn't prevent him from stopping a threat before more harm is done.

[potta_coffee]

Yes but ammunition manufacturers often advertise the enhanced lethality of their hollowpoints. It's pretty clear that it's seen as a benefit.

[jvergeldedios]

I should have been more clear. That was the point I was trying to make. Anyone I've talked to about using firearms for home defense likes hollow points because of the damage they do to a home invader, not how much safer the rounds are because they stop.

[potta_coffee]

Well, over-penetration is definitely an important concern in a home defense situation. I remember reading a case about a man that shot an intruder with a .44 Mag, the round went through the robber, through his house, across the street to another house where it hit his neighbor.