You seem to dislike the article's framing, which is fine, but then you start on a crusade.
It's ok to plant trees so that hot people will feel slightly less hot. It doesn't need to fix every problem, just the small problem that there's too little shade in their tourist district.
The unstated premise of your post is that you know better than the Las Vegas city planners and that your ideas are purer than theirs. It's just so annoying to see this smugness from online commenters. "Their solution isn't Pure enough [therefore I'm smarter/purer than them]."
Maybe the Las Vegas city planners have good reasons for doing what they did. I mean that's possible right? Could it even be possible that there's more to this story than you understand?