It's one thing to post to try to learn things as well as pass along knowledge you have, and quite another to do it just to show how smart you think you are.
Also, 'book lernin's' and reality sometime contradict each other, like where you find out that androstenedione is eleventy billion times more anabolic than test or whatever. Just because somebody says they are a chemist doesn't make them infallible when it comes to chemistry.
Pb pretty much summed it up imo, give them the reasons why for whatever it is and let them learn it or not on their own. For example, I think soy is pretty much poison. I used to try to post reasons why when asked. Now all I do is say is 'those are my conclusions based on my research, now you go do your own or prove to me why I'm wrong.'