Who cares.
No seriously. Who cares. How would it possibly be worse? The US has showed its capacity to "mow the grass", as the Israelis put it, with its ISIS campaign. 65,000 dead ISIS fighters according to US estimates. Its territory shrunk to nothing.
If whatever follows assad is a threat to US or US interests, we mow the grass. We can keep a lid on it. Inexpensively. Forever.
Kill every single government official working for Assad. Destroy every ministry. Demolish every airfield. Destroy everything Russia has given them. Order the Russians out of the country. Trump set a Red Line last year. He must follow through now.
If he doesn't at the minimum what I said above, he's as big as a fraud as I've been saying for 2 years.
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Assad and Putin, by doing this today, are making a direct mockery of American power. That is its intent. "Look at what we can do".
The only proportional response is the largest American bombing campaign in 50 years. Not cruise strikes. Heavy bombers. The kind of shit that makes Europe's liberals moan about "proportionality" and other quaint/obsolete 1990s concepts.