Tom, you are right on all accounts. Human nature is violent, as is nature as a whole. However, as a society, we have tried to cherry-coat everything and "make nice" out of everything. I.E., civilization.

civ-i-lize (sv-lz)tr.v. civ·i·lized, civ·i·liz·ing, civ·i·liz·es
1. To raise from barbarism to an enlightened stage of development; bring out of a primitive or savage state.
2. To educate in matters of culture and refinement; make more polished or sophisticated.

The problem is, some people never get civilized. And some people that were once civilized, regress back to being "animals" because of a situation they are in, or perhaps from their disposition, etc.

It's all perfectly normal. This kind of thing doesn't surprise me at all. Someday I may regress myself.

Bart