Ah, but that's hardly a claim that needs substantiating. Everybody knows that people can change, adapting to your environment is a basic survival instinct.
Anyone arguing that people don't... can't change obviously has a deeply twisted understanding of humanity.
Maybe because it directly contradicts the facts? If people can't change then why is the recidivism rate in humane prisons 20% and in punishment oriented prisons 70%?
A more likely explanation however is that there is another reason why he is downvoted: because he suggests killing all violent offenders.
Anyone arguing that people don't... can't change obviously has a deeply twisted understanding of humanity.