On a slightly different note, what I find most creepy about mental health facilities is the fact that an inmate cannot rationally argue that they should not be there. The inmate may believe they are completely fine, and the doctor might listen compassionately to their pleas that they are sane and shouldn't be in there, but the response will be "I know you think you're well, but you're actually very sick, and you have to stay here". That mightn't be entirely fair - but it's the uncomfortable feeling I get.
I can readily imagine being put in one of those rooms, and told "I know you think you're sane, but you believe in an invisible man in the sky, so you're actually quite unwell and need to stay here until you are better".
At least in prison you can rationally explain that you're innocent and will actually be listened to. You can hire a lawyer, and there are clear procedures in place to determine whether you are in there rightly or wrongly. But if everyone thinks you're insane, nobody will listen to you, so there's no way out.
I feel much more comfortable visiting a prison than a mental hospital.