Like Father Like Son

It is such an amazing, yet, harmful quality of life. The ability to pass down certain traits from generation to generation. Consciously or Subconsciously, the ability to portray a personality trait your forefathers had, that you previously condemned. Examples are: Being abusive like your own parents even though you know its wrong or even becoming a drunk just like your father even though you hated him for it.

It just baffles me by the fact that they know its wrong but just keep doing it.

If you know mental and physical abuse is wrong.. Why do such things? 

Are they addicted to such behaviors?