This obviously didn't start yesterday.
My guess is you've been diagnosed with mental sickness at least once in the past.
Would you mind sharing what they found?
I would be surprised if more than 50% of people on this forum featured some sort of mental fuckup so great it incapacitates them in some way or another. Rpietilas fuckup is quite visible, that's what discerns him from many here. Also: there is no "normal" and no "sick", really.
What counts for me is that when you make a deal with the person he's honest, available and reasonable in communication and reliable in action. This has been the case for rpietila to an above-average degree on the occasions I traded with him.