There’s a broad push in the therapeutic psychedelic community to use the term “challenging” instead of “bad” because semantics and framing matter. I know it can be annoying, but some words carry an unfortunate connotation that’s best subverted by using a different word altogether.

I do take issue with the words “bad” and “good” in general, but I wouldn’t say that there are no experiences which can be described as bad. (I’m also an amoralist and believe nothing is inherently “bad,” so at least I’m consistent, however unpopular)

I recommend Frankl because I realize this sounds inherently invalidating, but if anyone is allowed to say it, it’s a holocaust survivor. I’d recommend “Man’s Search for Meaning”, which he wrote shortly after being liberated from a concentration camp.