The US is normally the country that bombs the middle east but in Aleppo it was almost exclusively Russia and the Assad regime that did the bombings. Saudi Arabia (and to a lesser extent Turkey) were the ones who sponsored ISIS. The US for once actually sponsored the relatively good guys in the conflict by backing the AANES ("Rojava").

This is not to say that the US had any moral reasons to choose the AANES. It was strictly geopolitics but even a broken clock is right twice a day.