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Umm... Okay, Link, you're entitled to that opinion. But, I think the Mars-rock evidence that micro-organisms once inhabited the planet is pretty good evidence. Plus, there is a (small) likelihood that the very conditions giving rise to life on Earth could exist elsewhere (Venus is pretty close), and as well those are not the only conditions capable of supporting life (as Ziroc mentioned).
I think ultimately there is enough probability of life elsewhere in the universe to at least look for it. Especially since the means of looking (sending out radio waves containing binary information coding for both pictures and text - including, perhaps unfortunately, a map) is relatively inexpensive.
I think we *must* look for other life just in case. It's precautionary. And, we want to be the *finders* not the *findees* if you know what I mean. Simple fact: any civilization that has been "found" was the weaker civilization.
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