No, I don't think everyone believes that statement.

But they "rely" on it.
Why not simply label everyone but those in "charge" of the world as crazy and then they can do with us as they please? And what's with all of the secrecy behind the new classification system/proceedings? That's really rhetorical - it's all about control.
So if someone has a day when they can't handle all the BS coming at them, doctors can say, "See, she doesn't have MG but a behavior disorder." As if women don't have enough BS about "feelings" to contend with. If you don't understand it, put a psychiatric label on it!
Uh, oh, I must have bulimia.