Allegedly, SR2 was setup in ways which made it much, much easier to run off with larger quantities of money than with SR1. Given the circumstances, you could reasonably conclude this would happen.
Running off with the money is probably the smart move. The quicker you can get off the radar with something like this, the better your chance of not ending up in jail. It is entirely possible they are made for life, and with no more incoming transactions, if they haven't left a trail, they can have their cake and eat it too.