Lots of people "Misunderstand" their religious texts. People come up with different interpretations of the texts all the time to fit their lifestyles. Nice people will spin Islam in a positive, constructive way, just like a nice Christian or a nice Buddhist, etc. Assholes will use it to justify their assholishness, just like the Westboro Baptists, Crusaders, Genghis Khan, 696 movement or whatever it was called, the Shaolin during their stint in Japan as pirate-slayers, the people in India who jump/coerce anyone who eat meat, and that one state clerk who wouldn't validate gay marriage. There've been good religious people and asshole religious people since the beginning of religiousness. Hell, sometimes they're both good and assholish, like Ghandi.