Why do we care about the Kurds?

I see so much in the news about Trump abandoning the Kurds, but I don't understand why we care.
Kurds don't believe in religious liberty, they persecute Christians. https://www.nationalreview.com/2018/09/assyrian-christians-face-persecution-kurdish-nationalists/
And Turkey is literally a member of NATO. Meaning, if anything, the USA is supposed to be helping them attack Syria.
Why do we care about the Kurds?
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