technicaly you are correct
but if the US were not there the Kurds would've been slaughtered by ISIS , Iraq (posibly ) , Assad or the Turks or some combination of the above .
the US have a token force there ,I think 900 which is there to protect , not kill unless attacked .

the Kurds are a good people and desreve protection whch they weren't getting from Assad .

this is what russia went in to Syria to support ......"

On the 12th Anniversary of the Popular Uprising: A Total of 230,224 Civilians Documented as Dead, including 15,275 Who Died due to Torture, 154,871 Arrested and/or Forcibly Disappeared, and Roughly 14 Million Syrians Displaced"
https://reliefweb.int/report/syrian-arab-republic/12th-anniversary-popular-uprising-total-230224-civilians-documented-dead-including-15275-who-died-due-torture-154871-arrested-andor-forcibly-disappeared-and-roughly-14-million-syrians-displaced#:~:text=The%20Syrian%20regime%20was%20responsible,2%2C048%20children%20and%20977%20women.

it was a russian intercention in an ongoing civil war that would've removed Assad if the russ had not intervened
as always , supporters of dictatorship and evil