Mental illness and other cognitive handicaps are usually irrelevant for administrative purposes. If an individual can operate within the realm of site policies and standard practices, they're welcome onsite. If they persistently violate site standards then eventually they have to go.

On one occasion I did mention an editor's self-disclosed psychiatric diagnosis when I proposed a siteban. That was because the editor also disclosed a related arrest history and the editor had developed a sexual fixation on me. Other exceptions also exist, but they're rare, and out of consideration I'd prefer to keep them confidential.

-Durova