Empathy for the suffering of a victim, does not have to lead to violence towards the offender. Even though that is very often how we feel at the time. (Believe me, I understand..)
Violence does not heal anyone's emotional wounds.
It does not benefit us, and does not help the victim to heal.
Undoubtedly, cases of child abuse should move any normal person to take action.
* Action to support and protect the survivors of abuse
* Action to move towards a situation where it will not happen again.
I agree that anger is one part of a normal and empathetic response.
But we do not need to attack people to express our anger, or outrage.
Modern society provides more healthy and constructive outlets for our anger.