I don't really think that is what happened here.
So I take it that you don't believe, despite the fact that 99% of all suicide terrorists are Islamists, that Islamists deserve any special scrutiny if they make public references to "America mourning on September 13th?"
You take it right. Maybe it comes from my living in New York and L.A. all my life (don't know what it's like where Eunice Stone lives), but Indians, Muslims, and other peoples of color don't freak me out. It'd take more than an "Islamist" joking about 9/11 to make me suspicious.
After Dahmer was caught, a friend and I (both white guys, like Dahmer) spent some time at a diner inventing Dahmer jokes. I think everyone who overheard realized we were only joking. I think "Islamists" deserve the same benefit of the doubt.