Did Trump actually act in the public good?

I’m listening to President Trump (speaking from Mar-A-Lago) make the most important speech of his short Presidency.  (The audio is terrible, from which I take an unseemly pleasure.)

But this is the first time I can think of, that Trump has acted from anything outside his personal self-interest.  It looks like he was legitimately offended by Assad dropping nerve gas on children.  I still worry that he’s acting mostly for politics, but in the end, when something terrible happened, he did what almost looks like the right thing.

Side note: Sen. Marco Rubio just spoke to NBC and said that Trump doesn’t need Congress’s support for war.  What a ninnie.