Maybe I'm misusing the term. The War On Terror is often used interchangeably in the press with "a clash of civilizations".Emphasis mine, either you are misusing this term or you have fallen victim to racist justifying nonsense.
I'm curious to know why you think this is racist or justifies nonsense. How would you describe homegrown terrorists other than as traitors? Have you heard the terrorists own words in this case? Even if you don't think of this in terms of "us vs them", the terrorists clearly do.