Psychopathy is a biological difference of the brain. Their brain is literally missing the specific mass needed to register their emotions. They aren’t suppressing their emotions. They lack the receiver required to register them in the first place.
Until technology and science can come up with a way to physically implant the missing brain portions, there is literally no healing for the psychopath from their psychopathy. Chances are, they don’t want the healing, anyways. They enjoy the calm logic they have. They see how stressed out everyone else gets. They have learned how to live in connection with society. Why would they want to “heal” anyways?