The parent asked why they cared, I'm not making an argument I'm answering the question.

My answer is that it's distasteful to them and their belief system / worldview. I happen to share the same distaste, though not on any religious grounds.

Who cares about Navajo tastes? Presumably other people who agree with them and would support a ban on vanity projects on the moon or who find it distasteful, like myself.