Assad has almost certainly committed war crimes, and is almost certainly continuing to do so. Just last week, an army helicopter dropped a barrel bomb—one of the most deadly and indiscriminate weapons in the regime’s arsenal—on a displaced persons camp, reportedly killing at least 10 civilians.
There’s not much point in collecting documentation on Assad’s crimes, though, if the U.S. doesn’t anticipate him being overthrown. And it’s starting to look more and more like that’s what’s going on here.