What are the reasons for abuse?

Justifying or finding ways to excuse abuse just gives the abuser more power. There is NEVER any justifiable reason for abuse. If you're angry, walk away, if you're hurt, collect your thoughts and state them calmly or write them down. Even if someone hurts you, abuse is not a justifiable act. Some people have come to accept it, horrifying as it sounds, because they have not been taught appropriate ways to respond to their own emotions. Compounding the problem, not enough people get involved and the person being abused often doesn't have the tools to get out.

There are only "reasons" behind the abuse, never any justification. The abuser may be mentally ill, or may have been abused themselves, or have impulse control problems because they haven't been taught to regulate themselves. But there is NEVER justification for victim blaming. If you are an abuser, get help. If you are a victim, if you see a piece of daylight, RUN to the nearest shelter. Rebuilding your life from the ground up is better than living with an abusive person, parent or partner.