When it comes to these kinds of acts of violence, I don't like to assume anything of anyone.
So keep right on making sure that you tear apart Grandma's walker and ignore an young Arab male right behind her. After all, we wouldn't want to hurt anyone's feelings with profiling. Now, if only we could get the terrorists (who will hereinafter be referred to as generic so as not to link them to any specific religion) to play fair with us....