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I just don't assume that all Sunnis feel that ISIS represents them.
I don't care. You are exercising an ability to state a logical fallacy, so discussing your point has no meaning or purpose.
Let me give you an example. Suppose ISIS takes over ABC, forcibly. They then start a war with XYZ. XYZ is at war with ABC. The subjects of ABC are enemies of XYZ. The cities of ABC and the military of ABC will suffer the consequences of losing or winning.
The subjects of ABC are factually, ABC. It makes zero difference if "all subjects of ABC" support or do not support ABC.
You are talking nonsense. These are areas of human behavior where action is all that counts. Example, French opposition during the occupation in WWII.