That's a frankly stale misconception based on old prejudice and Hollywood tropes. It's unmoored from reality.

Mental illness is not a monolith and it does not present the same way for different people.

It also doesn't mean you lose any ability to reason or understand what's being done to you.

I would highly recommend you refrain from commenting on this topic until you can correct your broader misunderstandings. Sharing misinformation and FUD helps nobody.