[bombcar]

What safety does society get with him in prison that it wouldn't get with him outside prison and restricted from any "financial" type job?

I don't really see the harm in him working at McDonalds, for example, except maybe he'd embezzle from the till, so put him on fries.

[tsimionescu]

If he's free, he could very well pretend he's someone else and skirt the restrictions, or convince someone else to act as his pawn.