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.
"Everywhere in space" is a size that is so big and vast that it is beyond comprehension. The space within our own solar system is absolutely massive by our own standards of space, but its a tiny speck in the Milky Way galaxy. Our galaxy is a tiny spec relative to the universe. There is a lot of space in space.
Also consider that humans have not reached or mapped many points on this planet, mainly isolated parts of the ocean. We could be in a relatively similar position if there are colonizer aliens. Maybe they think our galaxy is not worth exploring.
The scale of the universe is a cool and scary thing to think about.
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