i try to justify the david ruffin thing by thinking "oh well, he's only the vocalist, at least he doesn't write the stuff", plus, he was seriously fucked in the head, had massive drug problems and had a seriously fucked up background. all this comes through in his voice, yet it's still one of the sweetest, most beautiful and moving sounds made by a man.
also, the temptations were more than one person, does that mean i have to dismiss the vocals of the others, and all the musicians, including my favourite bass player on occasion, because of the mental problems of the lead singer?
like i say, it's one i struggle with.