Everyone likes a happy ending. As people, we like it when good things happen to us. Good things are nice. So it's only logical that we should unconsciously transfer some of that self-directed well-wishing upon an adopted avatar we've been in control of for 8 - 10 hours. Games. Happy endings. Good times.
But all of us, if we're well-rounded beings and not the kind of perma-happy, fixed-grin wearing perky wholesome types inevitably destined for cults, mental hospitals or TV shopping channels, have a shadenfreude side. The side that really wanted to see Luke join the family business at the end of The Empire Strikes Back. The side that wanted Avatar to end with a big blue tree-hippie bloodbath (okay, that was everyone). And because games are capable of more endings than other media, they sometimes indulge that side with multiple denouements of varying degrees of grimitude. And here are the grimmest of the grim.