I was initially taken aback over "dumping" an ally, even a conditional one, to allow another nation to go after them with overwhelming force. And truth be told, I'd likely pick the side of the Kurds anyway since I despise the Turks. So, yeah, I was bothered over the way it went down.
However, taking a step back and looking over it objectively, I tried to see what other options there were. There really aren't any good avenues we could have taken as a nation. We tried negotiating, that didn't work and the Turks were going to go in after they walked away. Of course, the news is reporting we gave the "green light" for Turkey to intercede, but that's not entirely accurate. Don't expect anything less from the Ministry of Truth these days anyway.
Regardless, we were faced with either continuing to support the Syrian Kurds and opposing Turkey, a NATO ally, and putting our forces in harm's way or stepping back. Neither choice was good. But I'll err on the side of keeping our troops safe for the moment and see how this unfolds.
Again, past failures to actually set up a legitimate and recognized Kurdish homeland with a democratically elected government are coming back to haunt us. And that's on Trump. And Obama. And Bush 43. And Bush 41. This problem transcends political parties and Presidencies. There's more to it overall, but I won't bore you with the complicated details since, in the words of one of your lawyer buddies, it's "simple."