alt Hacker NewsA mentally healthy person wants to be helpful. They want to be seen as helpful and they expect others around them to be helpful as well. This is the foundation of "pro-social" behavior: I benefit the group as much or more than the group benefits me.
Tying your identity to the place where you're helpful and where that help is appreciated and acknowledged isn't mental illness.
But this person was laid off. His help was (apparently) not appreciated, and he's not helping anyone by sitting alone in his car on the parking lot.
Do you think it is healthy behavior to go to a parking lot at 0900 every day and do nothing because you mentally cannot face the idea of not going to an office?