Semi-Charmed Life by Third Eye Blind is the usual one I see brought up.
Push by Matchbox 20 and Possum Kingdom by Toadies are arguable ones.
Also, Richard Cheese covers a lot of raunchy and dark stuff in a vegas lounge singer style. Rape Me sung in a cheesy upbeat tone is a trip.
A soldier, trained for warfare, and enjoying it is quite disturbing for people who never encounter it. I'm disturbed by it. That said, I'm not seeing anything about enjoying bloodshed there. He says he likes small wars because he feels there's less inhumane brutality.
Is your problem that a soldier enjoys what they do? That makes them a Nazi?
I feel like your comment about killing civilians in the global south is making a big assumption that isn't even really hinted at. In fact the opposite, as he talks about working with the local community.