One of the side missions Jason can undertake is helping a relic hunter retrieve the dog tags of Japanese soldiers who died on the islands in WW 2. The relic hunter does it largely for the money he gets sending them back to their families, but Jason insists that he won't do the mission unless the relic hunter offers the families a discount, which the relic hunter reluctantly agrees to.
Really, anytime Jason does anything good for anyone, especially his friends. Because it's heartwarming in its own right, but also because it reminds you that even though he's well on his way to becoming a monster, it's not a one-sided battle.
The Good ending, where despite being completely drug-addled, barely in control of his faculties, and a bloodthirsty killer that has, in his own words, killed more people than he can count, Jason rejects the Rakyat culture he was so infatuated with, declaring that there's been enough killing and he's done, while saving his friends. That single action is more powerful than any other he takes in the entire game, because it shows that he's NOT the remorseless, merciless sociopath that everyone wanted him to be.