First posted on my Mothman Flutterings blog on March 29th, 2010.
I wondered that myself while watching that movie. An excellent movie, in my opinion by the way...
Question asked on Yahoo Answers: Why was the Mothman Watcher sent to the asylym?
Beware; for some reason the link doesn't work, or it didn't for me; I got an alert that Yahoo removed the question due to "community guidelines." So here's what came through in my alerts:
It's not clear in the film but here's what I found on wiki :
"During the '50s, as Mason later mentions, the House UnAmerican Activities Committee forced all active costumed vigilantes to reveal themselves to one of their representatives. Due to left-wing friends that Mothman had cultivated while a student, his clearance was considerably more difficult than his companions. He was eventually cleared, but Mason describes the investigations as both lengthy and ruthless.
Mason speculates that the pressure of this meeting may have prompted his future drinking problem, but Laurence Schexnayder points out that the stem of his harder drinking was after the death of Dollar Bill. After a long bout of drinking, Mothman had a complete mental breakdown, and in 1962 he was admitted into a mental institution that Rorschach reveals is in Maine. "