Canadian industrial band Skinny Puppy were more than a little irritated when they discovered that the U.S. government apparently uses their music to torture detainees at Guantanamo Bay. So they sent an invoice to the Department of State to the tune of $660,000 in royalties.
Yeah, it's just about volume + repetition. Plus, for a lot of these guys, any sort of Western music isn't exactly native to their ears so it's more off putting. Think about the way lots of people react to non-western/world music
If you buy the music you can play it as much as you want. As long as your profiting on someone else's owned work.
I think it more about the moral approached of having your music unwillingly used for torture. I don't really think any band is trying to make money on this as much as they are saying torture is unacceptable and don't let me be a part of. Wonder how this situation will end up.