The nature vs. nurture and stability vs. change arguments remain quite controversial. In essence, it concerns the importance of an individual's innate qualities (their nature) versus the way they were raised, the interactions they have had, and their personal experiences (nurture). One asks, would we have had a Stalin had he remained in seminary, or not been part of a prison system that spurred ideas of communism, would Van Gogh or Tchaikovsky produced such masterpieces of art had they not had clinical depression...

Likely not, but the basis for their behavior is likely still part of their psyche. However, just because the capacity for good or evil is inherent to some degree in us all most certainly does not mean it needs to be expressed. Because of our cognitive ability to think as individuals and as a group, we most certainly can overcome deviance and move towards actualization and egalitarianism.