You’re right that we’ve seen no evidence of biological activity. I’m not really expecting any (though if we found some it wouldn’t upset my applecart...) But the building blocks are there, quite simply because we are made of the same stuff.
We’re an island of life in a dead universe, but the elements are all there for life to spread. I assume that our purpose includes spreading it...
Its going to take a while though, since we haven’t figured how to get ourselves off earth in any numbers or for any length of time. (And, then, there is all that radiation waiting to cook us once we get away from earth...) But I believe this is something we need to be doing. Its our “destiny”.
The problem is that the propulsion systems we can devise now won’t take us anywhere that can support life per se. Centuries from now, humans could be scattered among the stars — assuming that the spaces aren’t already occupado. And that of course means that we take care of the Moslem problem first.