The Importance of Empathy

If unambiguously evil individuals felt remorse for their crimes and have been punished, would we try to focus on their good qualities with a view to rehabilitating them? My own view is that we should no matter how bad the crime, can you just expand on that a bit? When we look at any person, it's unlikely that they lack empathy completely. Even the Nazis are often described as having been very cruel in their day job when they were working in the concentration camps,. But then going home to their families at night and reading bedtime stories to their children or being perfectly kind to their partners. And what we should be doing is cultivating that.