Elon Musk is leaving two of Pres. Trump's advisory councils because of the President's decision to withdraw from the Paris Accords. There is an expression on Wall Street, "talking your book," which means you talk positively or negatively about a stock you own without necessarily disclosing your ownership. One could say Musk is "walking his book." As I've said before, Tesla does a very good job of taking policy stances that, while they might benefit the environment, benefit Tesla more than other options would.
As for the established automakers, they are doing a great job of earning green cred by saying this doesn't affect them one way or another. But as Kelley Blue Book's Jack Nerad says, “Auto makers might try to mask their joy at the withdrawal from the Paris Accord on climate change, but many of them will rejoice that they will be less likely to be forced to sell vehicles that U.S. consumers don’t seem to want. A withdrawal from the Paris Agreement won’t undo fuel economy regulations in the United States, but it will make it more likely that we will see a relaxation in fuel economy standards going forward.”
in other words...
ADDENDUM: Jeffrey Carter seems to agree with me. Money quote: " Elon Musk’s entire company infrastructure is based on receiving subsidies."