He DID call out both sides.  But could he have called out each side participating in the violence more specifically?  Yes.  

I would have liked to see him name both the white supremacists AND the violent counter-protestors by name.  But of course then the same people complaining now would have complained that violent counter-protesters were called out.  Can't really win either way with the people that would ONLY be satisfied if one one side was called out.  (And even then, we know they'd just find something else to complain about.)