Leonard Pitts: America can still kill itself

Eighteen-year-old Dameon Shepard was playing video games when the mob came to his door. Some were carrying guns.It must've felt like one of those old westerns where the sheriff faces down angry townsfolk demanding the blood of the desperado inside his jail. Or, given that Shepard is black and the more than 15 people at his door were white, it might have recalled one of the thousands of times white mobs came for African-American lives.But this wasn't "Gunsmoke," and it wasn't history. No, this wa