I support the eventual withdrawal from Syria, but packing up now will place a large burden on Kurdish minority groups in the region, who deserve better. It will not be the first time we supported the Kurds while they advanced US goals and then pulled out ASAP.
It also seems the decision was motivated by conversations between Trump and Erdogan, which makes me think the Turkish will resume subjugating Kurds in the region when US exits.
I think we should withdraw by replacing more and more guns-and-boots people with books-hammers-meds people.
Leaving a power vacuum to be filled by Turkey or Russia seems to be the worst option, and imo a betrayal to our Kurdish allies who would not be treated fairly under Turkish or Russian control.
Edit: I really mean this question in good faith. This is my present understanding of the situation, but I do not believe I have the whole picture. I really appreciate the time anyone could take to point out an inconsistency or misunderstanding.