I agree.

Literally the *ONLY* reason to withdraw is to give a big middle finger to the international community.  That's the ONLY reason

AFterall, the only thing the deal requires you to do is set targets and publish your progress. That's it. And with no penalties for not meeting, why not just stay in?

He can still kill regs and revive coal and whatever else he wants to do.  STaying in paris doesn't prevent any of that.  The only thing leaving does is tell the rest of the world to F-off.