None of this is a reflection of PD but rather it's a perfect indicator of the current state of humanity.
Or rather:
A) This is partly a reflection of a world where many compounds are illegal, and powerful psychedelics are often sold by cash-hungry dealers for the explicit purpose of "getting high". There is no QC or purity guarantee on the source material. This also goes for mail order "research chemicals". Hence the "what did I take", "dirty acid" threads. To a lesser extent legal issues influence the "cough medicine" threads (DXM has worth IMHO but access means most won't be getting pure powder, the optimal way to do it)...
B) When you are younger, there is a tendency to *always* be a bit more reckless, sometimes in a stupid manner. (Hence the "OD", "hide from my parents" threads.) Everyone is young once. There is (my opinion) a better, more mature way to approach many psychedelics, and I think it's always good to guide those using them recklessly towards this path. (Leave the wild reckless fun towards other compound classes that are more suited for that.

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C) We unfortunately live in a society that lumps psychedelics with "illegal, evil drug use". Most of society to be honest is not even *vaguely* aware about what any medications -- whether it's an illegal molecule or something the doctor gives you -- does. Hence the many threads on what to take, what order to take, etc.
This is a pity. Psychedelics can be powerful tools. MAPS is trying to prove that (psychedelics for specific therapy) and I also think that, were it not for the law, it would be possible to use psychedelics in a more Westernized shamanic type approach (that is, psychedelics for self-help, reflection, self-improvement, etc.) In other words, push the benefits of "guided" / trip-sit experiences. The biggest issue with all these newbie threads is that it merely would reinforce to the average person the impression of psychedelics as nothing more than reckless hedonism. (To be honest that's too often how psychedelics are sold today.)