I like that you're all assuming you'd walk out of their alive.
Most people come out of prison in WAY better shape than they went in
It's not prison, but I know people who spent time in various county jails for weeks to months, and all of them definitely came out worse, and did their best to stay as far away as possible from going back (at least as far as I could tell).
You're discounting the risk of inheriting a large sum of money while surrounded by criminals. Getting sudden access to that sort of money is dangerous at the best of times. I'd be scared enough outside of prison, let alone in the presence of organized crime.
Why are you so sure you'd be left alone?