Right . . . what happens if everyone refuses to return?
The 'dark' forces would then have complete control of planet Earth which gives 'em yet another staging post, more power and greater abillity to take over yet another planet.
Seems if we return wiser than we left then in time we'd eventually defeat these bastards.
Why seek 'utopia' elsewhere when we can have it right here?
The only people who lose are those who quit . . .