The situation with the Kurds is a typical middle-east mess. They are our friends but Turkey is their enemy but has been our friend until now. I think we're better off supporting the Kurds.
This is the problem with Americans (and Westerners generally) and their understanding of the Middle East. Americans are predisposed to think of everything in stark, unshifting goodguy/badguy dualities. The Middle East doesn't work that way, it's an ecosystem of a million shifting alliances and enmities, and the people you are allied with today may be your enemy tomorrow, and the people you were allied against yesterday might be your new allies tomorrow. Sometimes groups can be your enemy and ally
at the same time, as recently was the case in the coalition against ISIS, where several groups who despise each other and regularly fight allied against a common enemy. All of which makes it very difficult for outsiders to get a clear idea of what's going on, and certainly makes any blundering influence by external forces likely to cause unforeseen outcomes. Westerners can spend their entire careers studying the Middle East and STILL get it wrong, the average layman brought up from childhood to think in Evil Empire vs. Good Rebel Alliance dualities haven't got a hope.
We still think of the world in terms appropriate for dealing with homogenous, centralised states, like how we opposed the German baddies, and then the Russian Baddies. Everything was clear cut, we knew who the bad guy was, what his motivation was, and what to do about it. In the Middle East, your best friend might stab you in the back while smiling at your face, your worst enemy might be the one protecting you from someone worse while calling for your death,
and tomorrow they might completely switch roles for reasons that are largely opaque to you.