Well, it is to the groin, which would, even with armor (perhaps ESPECIALLY with armor) have a certain painful effect, and I'm pretty sure that not liking using thu'ums doesn't exactly mesh with immediately resorting to them in combat. Also, where are you getting the "just to keep people from spamming them"?

Sorry this all sounds really hostile. I don't mean to be, I just sometimes get frustrated when I get confused.