Flyin'Dutch,
I see your point. Everything you say is possible. But only that, POSSIBLE.
I have posted questions for friends on PPRuNe. And I'm sure I'm not the only one who's done that.
Why not be open and up front? In view of the number of people who condemn someone for life for one instance of drug usage - and I don't mean you; it's occurred on a number of threads over the years - do you really need to ask that?
Unfair to your competitors? Yes, but from what I've seen and heard, and I used to be into bodybuilding in a minor way, so common that if you're in that world you hardly perceive it as unfair...till you come out of that world. Horrendous perhaps, but true.
Initial and renewals? You may be right, but he/she mentioned in the first post about it possibly staying in the system for 18 months. Perfectly possible to be worried that it might get missed once, but not the next time. Illogical, but possible.
I'm not convinced about this personality problems bit. I was a child of the 60s; I knew so many people who used recreational drugs, the vast proportion of whom have gone on to do all sorts of difficult and responsible things, including flying. You're only likely to hear about the ones who DO have problems.
You could be right, but IMHO you're making an awful lot of assumptions. I tend to assume people are innocent until PROVED guilty. I reckon that there's still some reasonable doubt in this instance.