Why would the danger of asteroid strikes be a reason for space colonization? It's much easier to find and divert dangerous objects than it is to establish a self-sufficient space colony.
Perhaps start with fixing the planet we are currently living on?
No more colonizing. Fix the shit we already have.
Don't misremember the meaning of the word "colonize". It has no direct bad meaning to it.
Only If you ignore all the genocide and slavery
Genocide and slavery are wrong and you should use those words to describe those actions. Colonization by itself is not.
It does carry a certain meaning, it comes from a certain Columbus guy.