I think there may be something to the idea that "artistic temperaments" have a difficult time in dealing with the real world. You have guys like Michelangelo, who scarcely cared for human company; preferring his studio and his marble. Beethoven was rude and short-tempered and drove his own nephew to attempt suicide. Van Gogh had fits in which he lost control of himself. Gibson may be cut from the same type of cloth.
He makes the late Bobby Fischer seem sane, by comparison.