Most medical definitions of the term disability largely rhyme with the CDC's:

https://www.cdc.gov/ncbddd/disabilityandhealth/disability.ht...

>A disability is any condition of the body or mind (impairment) that makes it more difficult for the person with the condition to do certain activities (activity limitation) and interact with the world around them (participation restrictions).

Why would commission of a violent crime, which could lead to life imprisonment or the death penalty, be less of a mental health issue than sex or gambling addiction, alcoholism, etc which generally have less of an impact on one's life?

I don’t think the problem is it’s untreatable so much as it’s ego-syntonic (ie they don’t feel anything is wrong) and so they’re not going to ask for help. But most personality disorders are like that.

IIRC mass killers do have some prior behaviors in common, but it’s not that they like wearing trenchcoats and violent video games, more like they often start with domestic violence or hit women.

It is how mental health works though.

The DSM can record whatever the community wants as an illness.

Sure it does. All it takes is consensus.