In this summer of gun deaths, T-shirts promoting violence are popular in the city HAMEEN NURIDDIN is no stranger to what the streets can dish out. He works for the city school district, in the office that is responsible for school safety. It's his office that responds when students are affected by violence in or out of school. That's why Nuriddin was so dismayed when his 16-year-old son, Yusef, brought home a shirt he had recently purchased from Kicks USA in the Quartermaster Plaza, at 22nd Street and Oregon Avenue in South Philly. The white T-shirt has an oozing, blood-red...