You know how to fight the Islamaphobic urges you're feeling? Give the criminal a name.
Omar Mateen. It's the name of an evil man, like Adolph Hitler, Joseph Stalin, Mao Ze-Dong, Pol Pot, Timothy McVeigh, Osama Bin Laden, and many, many others. Specific men, evil men. Acknowledge that this was an evil, awful crime done by a specific evil, awful person, and you can direct the deserved hate you're feeling at him and the people like him, without letting it splash onto innocents who just happen to share his ethnicity/religion.