It’s a good observation. People like Hawking are pretty adamant there “must be” other life out there somewhere. Why are they so insistent?
I say it’s because, if they don’t find other life, then their “life arose from nothing” premise is basically falsified. If life only exists on Earth, that implies there was some intervention or special act necessary to create life, and that means the godless universe they dreamed up to escape accountability is a mirage.
Hawking and Dawkins are going to be in for a real treat once they turn in their life-badge.
In the end, all of that “knowledge” they possessed resulted in nothing!