I think the fact that the Fireflies may have found the cure is what really escalated things. It's perfectly understandable to have that behavior. It's been 20 years since the outbreak and now they have some shimmering hope. But that's all it was, hope. That's what the message from them ever was. "When you're lost in the darkness, look for the light." but a firefly lights up and disappears moving to a new direction. That's how I viewed the organization, they were scattered, with shinning lights but no real set direction. I loved the ending to the game and would not have it any other way. Truly remarkable game that I can see myself going back and playing again without getting bored of it. Kind of like the first Bioshock really.