Violence is not a product of mental illness. Violence is a product of anger.

[zazen]

12. certainly true with battering, which is usually quite "logical" and strategic

Lundy Bancroft has written a lot on this. Most male violence against female partners is based on anger, but that anger has to do with cognitions--the belief that he is entitled to own and control his partner. These same men don't go all out of control with their employers or buddies and usually not with law enforcement and judges. They're the model of rational sanity. These guys usually score "normal" on most mental illness inventories, while their partners who are usually fully traumatized appear like the "crazy" ones.

It's interesting that when their violence against their partner extends into a broader environment like the workplace it's when they believe others are colluding in violating their entitlement to control their domestic life.