Well, it now looks like there was Syrian foreknowledge and support of the raid, only they were told that it would be a snatch and grab, and it turned into a John Wayne shootout:

In the time-honoured tradition of covert US operations in the Middle East, this one seems to have gone spectacularly wrong. The Syrians, who had agreed to turn a blind eye to a supposedly quiet “snatch and grab” raid, could not keep the lid on a firefight in which so many people had died.

So it appears that they Syrians were expecting a quiet op, and they got a bunch of citizens killed in the process.

I’m sure that this will make them much more likely to support such an operation in the future.