To your first point, I don't think pulling out is a moot point because it's non-binding. If it was binding, would it even be feasible to back out? Backing out of the agreement is a selfish message to the world that the US will serve themselves before it serves the planet.
If China and India were a problem, then wouldn't it be possible for the other countries signed onto the agreement to punish these India and China in some way?
To your third point, even though it may have seem telegraphed, I still think people can be genuinely shocked by this. Trump bloviated about a lot of things while campaigning, but he has not followed through with a lot of his promises. He's changeable as anyone (think about how he quickly shifted his opinion on North Korea after a few minutes talking with the Xi Jinping).
I totally agree with your last point. Coal is dying anyway, and clean energy is providing many jobs. But still, it's disconcerting to see our government clinging to their big business ideologies
It is moot because it's non-binding, right? I wouldn't say it's moot if it was binding, and somehow, Trump forcibly got out of the agreement. And this was all down to score political points. For Trump, it made sense -- he needs the support from his core constituency, and going strong on a moot point gave him a "free ride," so to speak.