Yes, Russia and Iran; what's the alternative to avoid that? They have a stronger hold, and would seriously hope US intentions in Syria never involve battling either of them. While my views are also a bit selfish and ideological, that's where reality creeps in. US involvement in Syria was a mistake. US withdrawal is an excellent humanitarian and diplomacy opportunity for countries which are already carrying the burden of relief. If they step up and do something about it remains to be seen. It may not appear important to them to clean up the mess, but seems a smart thing to do if they're interested in sending refugees home.
Oh, ok. Yes, I'm sure if we surrender the Near East to Russian dominance, that's a great plan.
Was Syria a mistake? If we hadn't fucked it all up in Iraq, it wouldn't have been necessary.
Given that though, there really were no 'good' options. The best (realpolitik) probably would
have been supporting Isis covertly. But boy, what a tightrope to keep that from blowing up
in our faces.
The nation couldn't stand for a real robust reaction in the region.
Injecting ourselves was probably the best feasible option, dealt a terrible hand.
Unfortunately, it meant long term, low grade involvement. Something we could
have maintained. The really sad thing is that the one ally we're pleasing with pulling
out - is the one which our presence in the region is perhaps the only long-term bulwark
against them being forced to align with Russia, in the long run.
Putin hit the jackpot with this joker.