My Opinion;

Abuse to others and abuse to others who abuse are both mental disorderly that are the same actions, only separated by intent. Abuse is abuse which is destructiveness and that is an immoral act of the ego and is inhumane-nature. The term "Abuse" can be interpreted synonymously with "Destructiveness" which is inhumane-nature. Basically, when you "Abuse those who are abusing", the idea is that the act is moral, but these are equally the same act and only separted by intent. "Your intentions are the foundation of your actions." Example: You could kill somebody for an unknown reason OR you you kill somebody using self defense ... The actions are only separated by intent but intent does not change the morality of your actions. In the example above, the killers had two different intentions but the action is still the same, because killing is killing. There is no way around that because killing is an immoral act of a inhuman-nature not brought about by instinct, and is caused by aggression or destructiveness which are both immoral acts of ego-consciousness.

Erich Fromm says;

The "pathology of normalcy" rarely deteriorates to graver forms of mental illness because society produces the antidote against such deterioration. When pathological processes become socially patterned, they lose their individual character. On the contrary, the sick individual finds himself at home with all other similarly sick individuals. The whole culture is geared to this kind of pathology and arranged the means to give satisfactions which fit the pathology. The result is that the average individual does not experience the separateness and isolation the fully schizophrenic person feels. He feels at ease among those who suffer from the same deformation, in fact, it is the fully sane person who feels isolated in the insane society - and he may suffer so much from the incapacity to communicate that it is he who may become psychotic.

"Destructiveness is the outcome of unlived lives." - Erich Fromm

To Learn More, Read: "Erich Fromm - The Anatomy of Human Destructiveness"