I believe if life is common than there must of been at least one group of aliens that at least attempted to colonize it self everywhere in space?
Unless humans are a extreme anomaly and that most other aliens don’t really care about space exploration, and just focus on their home planet.
I'm still not ready to embrace creationism, the primordial seas had a couple of billion years for the right ingredients to combine. On a long enough timeline even highly improbable events become likely occurrences.