Writersoul
You can’t undo certain things. If a person ruined their mind and body with drugs or doing other things there’s no undoing them an there’s a certain regret and possibly even addiction or strong tendency to certain things that will have to be fought for many years. Just because he or she comes back doesn’t mean they are healed or whole it just means they realized the foolishness of their ways. They still have to live with whatever effects their choices had on their physical or mental well-being. For example if a girl makes a certain mistake she can’t take that back and so to a guy to some extent for that matter. It’s something that they will have to live with for life. Whatever demons people on the derech battle it’s no comparison to what people who came back have to live with.