I guess when they say they're of sound mind that means they knew exactly what they were doing, because if you take that at face value it's a farcical statement to make!
As to the Bulger case the sentence they received & the care & attention they had after being released didn't stop one of them from ending up in trouble again , maybe not murder but hardly the sort of person you'd want living near you even with an assumed name! These do gooders have a lot to answer for!.