Maybe it depends on what they have the capacity to perceive and what they choose to do with it. Like James Fallon - he's putting in an effort to act with more empathy, even if he's not feeling it - like he said 'I don't care'. And maybe that is a way of 'paying all in advance'.
Maybe that's what would need to happen eventually, you'd need to start to feel the effects of your actions or mode of being viscerally in order to start to develop a soul or conscience? I guess it depends on why someone is putting in an effort to act with empathy. If he's doing it because he thinks he'll get something in return, then it's not a real 'deep down' reason to do it. It's superficial. Maybe over time, that could lead to developing the actual circuitry to include that in his make-up, kind of like 'fake it until you make it'. But I think a key is to feel what you are doing at a deeper level. I think that gives some sort of insight and wisdom to things, because your actions and decisions mean something more and have consequences that you experience viscerally.
In the Raine, Samenow thread, someone mentioned the similarities in the 'criminal mind' to the 'addictive personality', and when in that state of craving your addiction, you don't care about anything else except getting what you want that'll provide immediate relief and satisfaction. It's all that matters because it allows you to 'feel good' but with a hefty price you don't have to worry about until later - which in a roundabout way, is sort of how a psychopath operates all the time. They are always searching for whatever brings about a 'high' and will do anything to reach it despite any consequences (or the consequences make it more appealing). Although they don't seem to pay the same kind of price later on because they lack the visceral feeling's involved with guilt, shame and regret. But some hardcore addicts, not many, according to Gabor Mate, have pulled themselves up from the most dire of situations despite all that they've done to themselves and others.
But under the 'right circumstances', would a person deemed a psychopath be willing to do the same? The situations are quite different, and don't psychopaths inherently look down on most people? I guess there would have to be a willingness to confront the psychopath and expose the mask, and there would have to be something, anything inside of them willing to stand that 'test'. I think the only way is if a psychopath, knowing that there's something 'off' about them, willingly sought out help. Maybe with Fallon, seeing as he's sort of trying to admit to himself and others what he is, even if his motives are questionable, there may be a chance. Psychopaths must run on a spectrum and some are far worse than others. Otherwise, picture trying to help John McCain grow.