Ok,
We all know killing rebels and civilians is a bad thing in this game.
I'd like to see a reputation system added where doing good or bad things to them has a cost/ benefit.
For the rebels, releasing them from their prison cells adds to your rep, and you maybe benefit by getting stronger vehicles, or better spotting etc. Killing them obviously has the opposite.
For the civilians, too many deaths means they alert the cartel to your presence, or run away. Benefits could include spotting bad guys in town etc.
Maybe even add to resource side missions by driving the food truck to a town and giving it to the civilian population after tagging it.