There's still nothing innately wrong with the idea of colonizing these worlds.

Just because certain groups of people have beliefs about the "wrongness" of something, doesn't mean that they're in the least bit rational or need to be given weight. The uh space, beyond the Earth is literally a blasted wasteland created from ancient formation violence. Nothing we do in that sterile, radioactive, chemically toxic vastness of planets, rocks, ice and open void would by any sane definition be comparable to some sort of ecocide on earth, where extremely precious flora and fauna are destroyed.

The philosophy of degrowth is entirely a subjective moral view, no more morally valid than a philosophy of more growth, and humanity is emphatically not a virus, it just is, like any other complex species on Earth.