That's not how mental illness works.
But there's still an internal logic there.
The veteran suffering from PTSD who pulls a gun in a drug store after something falls off a shelf suddenly isn't "randomly violent."
We don't see the reason. We only see the result. It looks scary.
It's not much but that's still a lot more consideration than most mentally ill people get.
There are sometimes periods during my deep depressive episodes when I feel reticent to take a shower because I will be alone with my thoughts without a distraction for 10 to 15 minutes.
My dad is the same and he isn't seen to have a mental disorder.
No, folding my arms is comfortable and eye contact with strangers makes me feel extremely uncomfortable. Mild mental issues, but mental issues nonetheless.
The truth is that merely interacting with a cold and uncaring society on a daily basis can do that equally well.