I have this idea in my head called selective saving.....idea being that If I don't like a country/region or group of people in that country/region for a reason of my own choosing(ethnicity, their leader, religion, personal indifference, really good reason or really bad reason) then I let them fry. Take for example France on the day when I'm called to save us all I may decide I hate french people so if this outside force is about to annihilate just France I may say fuck it and let them die. But the rest of the world I do save....they can't get mad cause thier dead and the rest of the worlds nations can't be pissed cause I coulda let them be pounded into oblivion.
Now if its the whole world at once on the other hand I think I would save us all even the bastards that I despise, but make sure they know worlds savior has no love for them. And also I'd think that being a hero the world over would have some insanely awesome rewards(name rememebered forever, shit tons of cash, property and other stuff just being given to me and oooh the women the hot ones would want some of me thats for damn sure and the fact that they'd most likel know my name would be even more awesome. I'd never be at alack when it came to female company)