He's probably hoping this'll wash away his blunder, and that his decision to keep troops in the oil fields will block Russia and the Syrian government. But he's already proven himself to be far too erratic and unpredictable to trust.
Not only was this a massive strategic blunder on Trump's part, it was also really bad from a self-preservation standpoint. Since the American government and public overwhelmingly supports the Kurds, his betrayal of them (and yes, it's specifically his betrayal, since he acted unilaterally) will do nothing but alienate people who might otherwise have supported him. You'd think he'd put a greater priority on optics, seeing as he's facing impeachment, but apparently even his sense of self-interest is starting to go.
Times like this I wish I had time travel and mind control powers.