I'd guess there would be some "sane and physiologically stable people" who could easily consider saying to a best friend, "I think just maybe you could be more honest about me than i could be about myself."
Your man Trump has clearly shown everyone (whether they accept it or not) that he cannot be trusted on anything. So why the hell are we talking about this. Enough, maybe, eh.
"Any sane and physiologically stable person would trust themselves over any other person."
You're drifting. We weren't talking about trusting others on everything.