because they're a bunch of jerk offs who failed at life and everything they do.
because they're mom's used and abused them as a child because they were ugly and ashamed to have such a fugly looking child of their own.
the kids father is the man who raped their mom and left her to die on the side of the highway. THATS WHY MY FRIEND. OMG IM HYSTERICAL. lolol
so to make up for lack of a worthy life, they steal and rip people off.