All Washington wants is to be able to say "We win!"
That's the most rational explanation for why US ally, Turkey is shelling US allies, the Syrian Kurds, who are crushing the US-backed, jihad-loving 'moderate rebels' and jihad-loving ISIS.
Not incoherent at all.
Related, Saturday's "Who's Fighting Whom In Syria":
This *simple* chart shows all states of hostility currently being played out on #Syria’s territory#IntractableWar pic.twitter.com/1inprNB6U0— Charles Lister (@Charles_Lister) February 13, 2016