ISIS Attacks Show YPG Can't/Won't/Don't Fight ISIS

Of course they, the YPG, don't fight ISIS because they are the symbiotic partner to ISIS.

Ethnically cleansing a vast swathe of the planet.

Both succored by US/Israel.

Which is why both of the recent "ISIS" attacks took place exactly where the US and their Kurdish proxies are embedded.
 
It's that obvious.