So what, Craft needed to twirl an invisible mustache or something for you?
To give an extreme example, I bet there were plenty of nice guys who were members of the Wehrmacht in World War II. They just thought they were doing the right thing fighting for the German nation, and didn't give it any more thought than that. A state can be evil without everyone who fights for that state being evil.
Craft seemed to be more or less disconnected from the war by the time we meet him anyway. He doesn't want to get back to the frontlines, he just wants to go back home and see his wife. So he's basically gone AWOL.