As others have pointed out, there is no mental illness really. Some of the the individuals that are looked at as crazy, were in fact the most sane out of all of us. Apparently especially as of late, the more and more you seem to want to think outside of the box whether on a drug or drunk, the more you're looked at as someone with a mental illness and quite frankly, that's just not the case. Thanks for sharing and although this is an old thread, it's most definitely an interesting read non-the-less.
Back in the sixties and seventies, there was this romantic notion of mental illness. "who's to say what crazy is, we are all crazy". But what they were really referring to was people on the spectrum of personality quirks or even neurosis.
Those that have been exposed to very sick people never keep their "crazy is fine" romance. With the advent of popularly used hallucinogenic compounds, people began to imagine their state of consciousness as somehow akin to psychosis. They figured that they had been inside the mind of, or actually been a psychotic.
Myth and legend didn't help.
But the reality is that these chemicals did more easily allow someone to imagine the horror of mental illness. Mental illness is a horror, it is often a definiting difference between sanity and otherwise. Spend any amount of time with truly Ill people and come away thinking you had just been given a reprieve from hell itself.
Imagine NEVER ever being able to depend upon your senses to know what is real and further, being uncertain of your social. Powers. "what did he mean when he said that" takes on a hideous meaning for the truly disturbed. Not knowing which "voice" in your. Head is "you" or mistaking social cues constantly while still having huge ranges of inappropriate emotions is my idea of torture.