There is a group/pack mentality that often occurs with young aggressive youth (most often males). Did with my group yrs ago to some extent...but seems it goes farther with many groups of young thug black males, heard mentality. Tons of police stories where young blacks in a group target single people. Most don't make the news other than local paper. Most recently with the knockout game and polar bear hunt (where groups of young blacks gang up on an unsuspecting big white guy...yep, this really happened heard it from several officers). Probably stems from unsupervised, fucked up broken homes with poor role models and absent fathers.