The problem with crack, heroin and motor oil is that two of them are relatively likely to get you addicted and then damage your body as you abuse them, and one is likely to kill you outright if consumed.
Psylocibin and LSD, on the other hand, are basically harmless (at a reasonable dose) from a physical standpoint, and non-addictive. So what's your rationale for not trying them?
You might argue you won't try them because most people won't try them - well, that may be a point, but a lot of people have tried hallucinogenics, especially in the 60s, and the vast (99.99+%) majority had a good time, is perfectly fine and was happy about the experience. So social proof isn't your reasoning for not trying them.
Which leaves the law. Perhaps you won't try them because they're illegal. Fine. Would you not try tomatoes if they were illegal? If you would try tomatoes even though they might be illegal, then what's the big deal about hallucinogenics?
Seriously, you claim to endorse learning, but you appear to have neglected to research this subject before posting.
Perhaps you would like to read some of these papers, and then come back with your assertions?
There is AFAIK no research that shows that crack, heroin or motor oil have similar positive effects.
The reality is, you have no idea what a trip is like. You're building an image of what it might be like based on your own actual experiences, and it seems pretty lame, but that image is just that: an image; a picture; not the real thing.
And, much like life cannot be experienced just by looking at pictures, drugs cannot be experienced just by reading trip reports.