Earlier quoted context omitted.
They can certainly induce a sense of the profound but I'm not sure they actually produce profundity. What's the difference?
One of the classic effects of LSD (happens to many but by no means all users) is a sensation of ego death - ie, your sense of identity and who you are in the world is either eliminated or greatly changed. This, as you might imagine, is an extremely profound feeling ('a sense of the profound'). But, after coming down, does this experience have any grounding in reality? Did it 'actually produce profundity' or was it a…
For example, although I had seen the Xena: Warrior Princess musical episode "The Bitter Suite" before numerous times it wasn't until under the influence was I able to emotionally and mentally understand the allegory of the episode.
Basically, the symbolism of Gabrielle having a "demon" child forced into her against her will, who Xena considered a monster and wanted to kill whilst Gabrielle blamed herself for it's inception is a very clear metaphor of a rape. It took a strong emotional attachment to the journey of the main characters to truly appreciate as well as understand the message encoded in the symbolism. It may not be "profound" as the meaning of everything but realizing that with my own devices was at least enlightening.
In my very limited experience mind altering drugs seem to turn off/lessen the assumptions one makes, to step outside the critical path and analyze information more in-depth.
[Edit] Correcting auto-correct