On the contrary, ISIS follows the Koran precisely. All good Muslims want to kill Christians and Jews. That's what it means to be a "good" Muslim.
Also, someone please tell the Mayor of Dallas that he just invited ISIS to attack his city!
Now just a cotton pickin’ minit here. Let’s be fair. Muslims are permitted by the Koran to tolerate Christians and Jooos! who faithfully pay their jiziya and walk in the gutter when a believer approaches, provided their wife or daughter isn’t hot, and provided they aren’t feeling ornery about something or other. They only began wholesale slaughter of Christians and Jooos! after the latter became uppity and started an international conspiracy to have their own country, and the Christians became apologetic and stopped lording over Muslims just because they could kick their ass on the battlefield, and what was worse, started helping the Jooos! in their conspiracy! The Koran doesn’t speak of such things, although the Hadith hints at them.