There are no doubt many people in magicdom, as in other sectors of society, who have mental disorders or psychological dysfunctions of varying degrees and impairment. Few of them, however, seek or find themselves in asylums, sanitariums, or rehabilitation facilities.
Harlan Tarbell, who lived in my hometown (Elmhurst, Illinois), was always an eccentric person. Bob Parrish called him "an All-American nut." He was interested in homeopathy and other eccentric, fringe therapies. He liked off-beat things. (This is probably what attracted him to magic!?) As he got older, his eccentricities became more pronounced or at least more obvious. I don't think he was insane--just a tad dotty and weird.
Bert Allerton, who reputedly had "drinking problem," ended up in the Elgin State Hospital (I went to school at Elgin Academy in the same city), which suggests that his alcoholism resulted in other, serious debilitations. This does not mean that he was insane.
Bob Hummer was indeed a strange guy. I doubt, though, that he was seriously insane or delusional--just a garden-variety wack-job.
Let's face it, if everyone deemed to be a "nut case" in magicdom were segrated into one place, I'm sure there would be enough wackos to hold a convention the size of FFFF. In fact, I'd love to attend THAT convention...that is, if I wasn't one of the nut cases deemed to be there in the first place?
Besides, consider what we do (as magicians) on a daily basis. Don't we live in a fantasy world of our own choosing? Don't we perform crazy things?
Years ago, I lived next door to a "shrink" and he asked me to frequently perform for the patients in the mental ward at Charity Hospital in New Orleans. The first time I performed there, I was led into the waiting room of the LOCKED ward. While sitting there, waiting to be ushered into the performing area, a man in a bathrobe shuffled up to me and asked, "Are you a doctor?"
I shook my head.
"Are you a social worker?"
I shook my head again, indicating no.
"What are you then?"
"I'm a magician," I replied.
He then nodded and said: "I see...you're a new patient then..."