From what I read about his childhood, I think the emotional scars he received back then from his father's constant abuse never really healed, but only got worse with age. His eccentric behaviour and odd lifestyle might be attributed to that.
The man was a music genius, no question...and usually geniuses are somewhat eccentric. So that could be a reason too.
And then there were the cases of the broken nose and burning hair and vitiligo. So many factors which added to the complexity of his persona.
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"If you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
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