My own style up to a point was for non-lethal takedowns. While in a Detroit alleyway I accidentally hit RB and deployed a concussion grenade among a group of street punks though. They weren't pleased and once they could see again they drew all their guns. I saw no option but to use lethal force. The silenced pistol came out. Half a dozen whispered headshots later, the alley was nice and quiet again. The very definition of 'collateral damage'. Besides, there's a much greater overall scheme at stake that made their lives insignificant and a worthwhile sacrifice!