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.
That's the thing that really tilts me with these arguments. Sarah Palin claiming to see Russia from her porch is more likely than some alien picking up Elvis from 20 light years away.