HUNDREDS OF students packed the library of the Academy at Palumbo High School in South Philly for yesterday's forum on Islamophobia, and supported their Muslim classmates with an outpouring of fervent finger snaps. Speaking against irrational fear of Muslims, Sofia Ali-Khan, a public-interest lawyer and a second-generation Pakistani American, described her open letter on Facebook, "Dear non-Muslim Allies," that went viral because, she said, "I think people were relieved to see other people saying, 'It's really gone too far. ' " The guest speaker for the event, Ali-Khan said it was clear decades ago that "the next boogie man after...