I agree, the focus should be more on the potential perniciousness of unchecked religious fundamentalism in general (it doesn't matter if it's the KKK or ISIS) and middle-east history of the last 15-30 years in particular (why do some people fall for such simplistic, de-humanizing organizations)?
ISIS is essentially a fascist movement and has as little to do with main-stream islamic values as the KKK has with christian ones.
You might find this article on the "why" less simplistic:
http://www.thenation.com/article/what-i-discovered-from-inte...
I think putting time and effort into these kinds of political and religious discussions is very important as long as we keep a cool and open mind - love and understanding against potential fear and hate towards "others" so to speak. Peace! :)