Which parts of our solar system do you think we should colonize?
It would take those nukes three days to reach earth, which is a huge amount of time for countermeasures to target and destroy them. And a handful of responding nukes could easily wipe out all lunar military sites and personnel, while lunar weapons could barely nick Earths military capabilities.
There's so many engineering and scientific advancements needed to make space-based sustainable colonies using materials sourced solely from Earth that your position would delay any colonization of space past a few great filters.
I was enjoying your takes on preserving Mars, but saying that humanity should only be allowed to change Earth is nihilistic in the extreme.