It's the old stable genius versus unstable genius situation. For genius to have a place, it has to not hurt the genius in any way.
So much genius comes with some sort of cost to the genius, in some form, like a vice as you say (e.g alcohol abuse), or the genius' mental health suffers since solitude and genius go hand-in-hand.
So much genius comes with some sort of cost to the genius, in some form, like a vice as you say (e.g alcohol abuse), or the genius' mental health suffers since solitude and genius go hand-in-hand.