You're WAY overthinking this sh*t! Trigger pullers, operators, combat arms, whatever…are young males who find an advantage in getting psyched up before doing their thing. They aren't sitting at the their computer doing some metaphysical dissection of the artist's geopolitical/psychoreligous mindset.
They are getting ready to go kill MF'ers! Got it?
They are good guys. Period. Stop with the anal gazing. I'm a retired good guy…yes, gun toter. Some of the guys had tastes in music that I didn't share. They were also some of the finest men and women I have EVER met and would gladly die for them and they would've died for me. I have stood over their dying and dead bodies. STFU about their musical tastes. If this gets them ready for the fight, great. What does your favorite athlete listen to? Worse, no doubt. Smear them, bitch!