How do you propose that he'd have come up with the marvellous world of music that he has unless he felt removed from most people in his formative years? Your formative years shape you, no matter whether you move to LA. So he will always have good cause to feel aggrieved at the world because it was only his own talent and outlook that stopped him becoming what happens to many- begrudging2000ly learning a trade, becoming unemployed, or accepting some dull job. In a world full of people who don't care about sensitive souls forced in to shapes by society that don't best fit them.

Bi polar manic depressive he's one of the best songwriter yet he comes out with stuff that's odd

I think it all started when Mile Joyce sued him. The feeling of being sued by a good friend must have crushed him.
"I wish Joyce the very, very worst for the rest of his life" - Morrissey (2003)

I assume you're referring to his militant opposition to eating meat and intolerance for meat eaters. I don't think that's an indication that he's 'disturbed' at all. He's all too aware of and has seen the unnecessary egregious torture that animals are put through in order to produce the food we eat. I do disagree with the way he acts as if all non-vegetarians are soulless monsters, but seeing that kind of evil perpetrated can be soul-crushing. His heart is in the right place.
It's common for people to get crabbier as they age, unfortunately. He can still be a delight at times.

I see no difference between eating animals and pdophilia. - Morrissey
Promise her anything, but give her a Pez!