If Assad is complicit of working with them because he didn't target them as much as he could have, when his government was being attacked in other places.

Would that make America, especially Obama and Clinton the biggest supporters? They did nothing about them despite being the ones with the most knowledge. Saw them roll through into Syria from Iraq, create Nusra, targeted them only when they attacked Iraqi allies and never attacked them when they were attack non-American allies.

When the Russians arrived. Despite a year of bombing, ISIS oil trucks were out in the open selling huge amount everywhere. It's only when the Russians took out their infrastructure that the Americans joined in. It's only when the Russians and Iranians took the fight to ISIS that the Americans got involved. But only to block the path of others.