Originally Posted by
secondpassing
"Fifteen percent of the prison population qualifies as psychopathic, while fifty to eighty percent qualify for ASPD," said Athena Walker citing: Ogloff JR. Psychopathy/antisocial personality disorder conundrum. Aust N Z J Psychiatry. 2006;40(6-7):519-528. doi:10.1080/j.1440-1614.2006.01834.x
So you're right, a not-insignificant number of criminals are not psychopaths, you can even say a majority are not psychopaths, depending on your definition of that word. So anywhere between 7 and 40 percent of rehabilitation efforts are wasted.
-As not everyone is rehabilitated (some prisons only have rehabilitation for 10 percent of their population source I forget from where)