My mother and girlfriend are both mentally ill to some degree. I wouldn't say I see them negative because of it, since it's a horrible thing to live with that requires a great deal of strength to just want to stay alive. I feel symphaty and I am proud of how well they usually deal. It can be horrible to live with for me, so it is in no doubt negative. Just as it's negative to live with anyone with a disease that will never fully be treated.
It really isn't more then illness in general, just in another department that usually destroys a bit more and fucks up your life a bit more. Especially since it doesn't go away. I mean, I wouldn't say I view cancer patients as negative, like they're weak or aren't trying hard enough, so no, I guess.