Spec Ops actually did have choices where you could be good (or at least less bad), but ironically people missed them because they didn't think being good would work.
For example, at one point you're being harassed by an angry mob of locals. A lot of players simply shot them because a lifetime of experience with shooters told them that no other input would be recognized. But in actuality, if you fired warning shots at the ground or over their heads the civilians would flee without incident.