^As is the one you just made, you know what Jesus said, don't try to remove the twig from your neighbor's eye until you remove the log from your own.
Yeesh, MGS, ya really need to quote the whole thing. 8(
Philip K. Dick once wrote, "Reality is that which, when you stop believing in it, doesn't go away."
I also take this stance, with qualifications. Not only for the reasons you mentioned, but for the temporary development of maladaptive behaviors/thought patterns (tuning, turning on, and very nearly dropping out) amongst "true believers".
A lot of the people advocating the benefits of these psychs are young/not-settled-down themselves, directionless, and in general focusing on psychedelic/mystic topics to the detriment of their real (or mundane, to phrase it less provocatively) lives. On the other hand, the scene itself seems to attract the aimless and yearning. It's impossible to say how things would have turned out had they lived differently, so my speculation could be a bunch of baloney; rethinking one's purpose/goals isn't a bad thing either, even if it takes a while.
What do you geezers think? I mean, wise and experienced older gentlemen, or ladies as the case may be.