A blind focus on ISIS is also a mistake as Al Nusrah (Al Qaida) is also heavily funded and commits atrocities as well. They are backed by Muslim Brotherhood from Turkey and operate in Syria.

I consider Muslim Brotherhood with Khorasan group far more dangerous than ISIS and I recall reading that some where else, but can't find the source now.

Fun Fact: The spokes person for Sweden funded Islamic Union is quite proud having his father happily punishing infidels in Idlib. Lovely guy.