Why do people steal? Take your pick, mix and match:
1. Jealousy (target has so much, criminal has so little, it's not fair!)
2. Desperation (whatever it takes to survive another day)
3. Sociopathy (missing bone in head that provides empathy)
4. Revenge (for anything from a simple "dissing" to having been actually f'ed over)
5. Incompetence (a la JPop/Skit-B, don't think they set out to defraud initially)
...and stir in a healthy portion of stupidity. Voilà, crime!
My condolences on being put through this, Rob. Don't let it eat at you, it's just stuff.