The premise was, probably - it is hard to tell if it has one, the bad guys formed this gang, led by the guy who had been traumatized by the cops, so he hates them. The rest of the gang, including the toss away female had no reason why they were there, either in the gang or on this odd adventure to break into these expensive homes.
As I learned in scriptwriting class, the first thing to keep in mind is motivation. If you don't have a decent motivation for your characters, the story will be a poor one. It doesn't help your telling the story if you just make up some motivation to simply have one. Like they did for this movie.
I saw it on late night TV and actually cheered when the commercials came on. I hope I never have to watch it again.