I mean, “Nature” is a dialectic all in itself. It is at once both the ultimate origin of the human species, and everything with which we sustain & furnish ourselves; and at the same time it is the origin of every disease that would harm us, and of every condition & necessity that allows for one person to hold dominion over & abuse another. For that reason, it would be unwise not to attempt to make ourselves the masters of it.
But I would disagree that there is a “dialectic” between the “natural”, and the “unnatural”. That’s a position born either out of theology, or of pastoral romanticism. Instead one might say that there is a dialectic between those things which are the product of human society distinctly, and those things which are not, but both are in fact contained within the broader scope of the Natural.
Okay, but why? Particularly in the case of Mars, which doesn’t presently have an extant ecosystem.
I mean people usually do not engage in extremely expensive infrastructure projects for the meme of it. That’s precisely why NASA said that we can’t do it, and should bother. The question is why you have a moral, rather than simply practical objection to this?