Probably a friend of the gang members so they could have a record of their handiwork.
I agree. So I then wonder how it got to the media?
More and more of these evildoers tape their crimes or make no attempt to conceal their actions. Either they are incredibly dumb or they have no fear of the “justice” system. After those animals beat up those girls in Long Beach CA last Halloween and got nothing but a tap on the wrist it figures they know they can assault and cause mayhem with almost no repercussions so why not go for it.