I prefer the glass half full view of possibility is all. No one has 100% certainty that life exists elsewhere, but its certainly higher than 0% certainty.

For me this is nothing but a mental perspective. Historically we trended toward a very strict heliocentric view of the known universe, to the point that evidence was ignored. I would like to stay away from that side of scientific curiosity and keep wondering and exploring. It doesn't negate what you're saying at all, but its certainly more optimistic.