@Friend:
I did enjoy/find amusing the sense of despair when it was revealed to the Gantz players that everything that they had done prior to the invasion, all those aliens killed actually made their situation worse since the aliens previously were there to ally against the final aliens. At least in a roundabout or coincidental way. That must have been a proper kick in the balls.
Nothing they could do about it. They tried talking with the aliens before, and one of them said there's "something in their head (the bomb chips of course) that FORCE them to see them as enemies)"
The rich guys are the ones who screwed humanity, not the players since they were just trying to live.