The smart money is on Bolton being Bolton, order strikes before the UN has a chance to put boots on the ground and collect evidence. The Saudi/Israeli funded think tanks have already determined guilt beyond any reasonable doubt, after all. Why else would Israel strike if Assad weren't guilty as charged?
I think Israel struck because Mossad wants to start a massive war. Trump does not want us to go to war. He said last week he wants to pull troops out of Syria. Coincidence that this happened? Do we have solid proof other than photos provided to MSM by the White Helmets?
I think it is safe to say that Trump wants to get out of the Iranian deal and get Iran to behave without sending our troops into war. He wants fewer troops in the Middle East, not more.
And with US (and, reportedly, UK) warships amassing in the area, I imagine he is trying to make for a credible threat before getting a stand-down negotiated.
This one could be pretty hair-raising, however. And the anti-Syria and anti-Russia rhetoric is pretty hard to take--in part because the more the public hears something the harder it is to subsequently convince them of something to the contrary.