Maybe they just feel alone, depressed, underappreciated and like nobody cares about them?
Revealing it to total strangers somewhat obscures potential negative impact, while still getting them to feel important for a day.
I only speak for myself, and I no longer have a clearance. But the idea that depression excuses disclosure of classified information... that's not how depression works. That's not how clearances work. It's anathema to me. If depression is an excuse for disclosing classified information, then depression is cause for denying a person a clearance. It is cause for revoking a clearance from a person who seeks mental health assistance. No thank you. It is much better to prosecute depressed people who violate their clearance agreements and to continue to permit depressed people to gain clearances than it is deny a clearance from every depressed person.
I support giving clearances to depressed people, and I support sending depressed people who violate their clearance agreements to prison.
I see your point, in not trying to worsen things for depressed people - but don't you think on a general base, a mentally unstable person is more liklely to disclose something? And when you are really, deeply depressed - you don't care about anything anymore, except if it makes you feel better in that moment.
First, reread everything that you wrote, and substitute "depressed person" for some racial minority. Most of what you have said is still valid and there is a possibility that it is even true. However, you must see that this would be so offensive that your post would be flagged.
Instead of fostering predjudice against people of a racial minority, you are (probably unintentionally) fostering predjudice against people with mental health problems. Do you not see why this is offensive?
Lack of caring for elemental things, including life, is a common trait of depression, not race.
But I did not say, depressed people should not have any clearance. I say, mentally not stable persons can simply not be trusted with every tasks. No generalisation. It depends on the task. So I doubt, you would offer the guarding of the red button for example, a suicidal person. And deep depression, is mostly combined with suicidal thoughts. There was a pilot some years ago, piloting a full plane to join him along his suicide. So much for extreme examples.
And as for the secret new release of the hot new game console x? I don't care about their security. But I see, that companies would want stable persons there, too.