Absence of evidence is not evidence of absence.
...and its up to us to spread life throughout the Universe. If thats the case then we hard better stop all this control-freak fighting amongst ourselves and get about our real work.
Wonderful statement. That's a beautiful thought, my friend. I highly doubt, though, that it's up to us to populate the galaxies. I happen to think that we'll never find a single one that's devoid of life.
So your saying that because there is no evidence of others being there is proof that they really are there?