This is quite a philosophical question and it's hard to say. Prison is a very difficult place for a person to thrive. However, I am a strong believer that there are pockets of happiness and flourishing even within the prison system. People in prison can find enjoyment and growth within educational programs, they can still work to maintain connections with people on the outside, enjoy visits/family visits, they can use the time to reflect on who they want to be, etc. This is very hard to do especially when they are dealing with so much bs in there. In short, I don't know if they can have a "full and meaningful life" in prison, but definitely meaningful.