Pragmatism. We live in the real world, one where threat of violence and actual violence is indeed sometimes necessary. Wouldn't it be nice if everyone was peaceful and we could all get along happy and free? Sure, but that's not the world we live in and sticking my head in the sand and leaving the necessary dirty work to other people would bring me no more peace than helping do the necessary things as well as possible.

The most weaponlike thing I worked on was a sniper rifle program, and to me precision weapons are one of those best you can do in an imperfect world kinds of things.