I'll bet a crisp new Benjamin that these thugs are drug dealers and those in the house they "invaded" owed them money. Either that, or those in the home were a dealers themselves and screwed these dirt bags over with bad drugs.
In any event, it's sad to see what used to be crime types largely isolated to around and inside the perimeter move out to the 'burbs like Cumming. Fifteen years ago this kind of crime was unheard of there. Jason