Welcome & getting started
@Historylover There's a lot of stuff in this thread that covers a broad subject matter and honestly I don't have the energy to comment on all of it right now. But damn, I just had to make mention of this:
@Historylover wrote:Am I suggesting everybody should know such a cure? Well, yes - I am. Some may say I should not make such statements - but when it is true, it is irresponsible to allow it to not be said.
You can't imagine how liberating it is to hear somebody talking so much sense! 
You know what really drives me mad? We have all these PSA organizations like RUOK? geared up to tell the 'normal' members of society how to handle the suicidal & 'mentally ill' members of society; and the essence of those messages is: "Fob them off on to a 'professional' who knows how to handle these people..."
Now, assuming your average citizen is indeed too uninformed to just naturally know how to help the average person in need, why can't these ad campaigns inform the general public directly about what they need to know to directly help the person in need?
I think about this in terms of the random bystander stumbling upon a stranger who is just about to commit suicide. Due to the norms of our society, the bystander automatically assumes that the suicidal person is in error for wanting to die, and feels obligated to convince them not to commit suicide.
But, apparently, they don't know how to do this. And this is where the whole situation becomes absurd as hell for me.
Clearly the bystander, for whatever reasons, has chosen to abstain from suicide - the fact that they are alive to confront the suicidal person proves this. So having made this massive life-defining choice, shouldn't they be able to present a compelling, coherant argument as to why survival is the better choice then death? Shouldn't they be able to present the same compelling reasoning that has decided their own choice to survive - a big, big life decision that has decades of repercussions?
Typically, no they can't!
I. just. cannot. comprehend. that.
How do you make a massive decision - a decision to abstain from suicide - a decision that locks you on a certain course that defines an entire lifespan - and have no rationale behind why you did it? How do you not give that matter one iota of considderaton?
Granted, there are some real ninnies out there who will sign up for the marines, or get swastikas tattooed all over thier faces, or hold up a gas station at gunpoint without any forethought whatsoever; blatantly life-defining choices made irrationally on a whim - yeah, some people actually do that. The vast majority of society looks at people like that with confusion and we shake our heads.
But in much the same vein, you have a vast majority of the population wandering around, having made a whoppingly far-reaching decision to abstain from suicide - and the majority of them have no idea why! And when they meet an actual suicidal person who confronts them about why somebody should choose life over death, they just stare at them, mystified! These supposedly intelligent bystanders have no evidance or rationale whatsoever to back up a decision that they themselves have made, and have been enduring the consequences of for decades!
Talk about conformity gone mad!
But okay, let's look past the fact that the average non-suicidal bystander has no idea whatsoever why a person should choose life over death. Thankfully, organizations like RUOK? have put out tonnes of publicity about how to handle suicidal people. So surely this bystander must've had the rationality of survival explained to them by RUOK?, so that they can pass this information on to the suicidal person! Surely RUOK? must've explained to everybody the compelling and coherant evidance that proves that life is better then death!
Nope! Wrong again! All RUOK? will ever tell you is to steer the suicidal person into the sealed quarantine of the therapists office.
And that is how they cover up the fact that the suicidal person was the sane one all along. Because the dialog that manages them and controls their future behavior is now hidden behind the therapist's door of patient privacy.
To get back to your point - you are absolutely right. Everybody should know how to cure the life of the suffering person. If we are to live in a society full of people who predominantly believe that life should be chosen over death; then pretty much everybody ought to be able to compellingly and coherantly prove that life is the better choice. And for those who can't wrap their heads around the rational themselves, our anti-suicide PSA campaigns ought to explain in plain english why a person ought to believe that being alive is better then being dead.
This should not be some top-secret that only therapists are aloud to know, and are exclusively "qualified" to dispense to the people who need this information! It ought to be free, public knowledge!
And don't get me started on people who go on and on about how: "the only people who ought to be handling the 'mentally ill' and sucidal are the people who have adequate training to handle them..."
Dear god. What hope do we have when we live in a society where it isn't just common instinct to do exactly what a person in need asks you to do for them? Especially if it's your stated job to help them?
Sorry for the insufferably long rant, @Historylover . 
That got me really fired up.
Damn. Now I have a headache.
