Before people get all giddy about the fall of Assad. . .

 we should keep in mind that, while reprehensible, he was not an Islamist.  

The group that seems to have come out on top. . .for right now, basically is.

And some rebel group is already fighting the Kurds.

Assad was a Baathist, which is to say a fascist.  Fascism is reprehensible, but it is a Western secular idea.  That doesn't make it great, but it also isn't a sectarian Islamic band of jihadist.

Some Syrian rebels are democrats.

Not all by any means.  Some are Sunni jihadists.  Some, Al Queda, are very extreme jihadist.  And in Syria, some are Kurdish nationalist.

We back the Kurds.

The Turks are backing the group that has the Sunni jihadist in it, perhaps because they oppose the Kurds.

Iran was backing the government, as was Russia, which is in no small part why Assad fell.  In its murderous desire to attack Israel, Hamas caused a war that brought Hezbollah in, with both backed by Iran, and they got utterly pounded.

Ukraine has done the pounding on Russia.

So now what?

Well, strong multinational efforts, including frankly a very strong UN peacekeeping force, are in order.  

But of course Donald Trump has already declared for doing nothing.

Doing nothing, is doing something, and that something won't be good for Syria in general, or the Kurds in particular.