IMO This is a dangerous way of thinking. This is the Timothy Leary adage that you are stating. It is not just a "set and setting" issue. Whether or not you have a good or bad trip, or whether you are alongside kind empathetic people or whether what you see is positive or negative does not matter. It has a lot to do with the person individual makeup, sensitivity, ego-centricity, and pre-ingrained beliefs. They do not automatically go away after the trip and the realization. The realizations come into conflict with them. This can very easily be a catastrophic event for some.

I personally think Ayahuasca gives an amazing capacity to see the potential within the universe and within ourselves... it is nearly infinite. However if you deeply understand the world and how mis-aligned it and yourself are from that potential it can create tragedy. If you believe you are responsible for this tragedy it can create catastrophe. I don't mean to over-extend my own experiences too far.

What if there is a book that when you read it you would know for 100% certainty when you die there is no hell, and only infinite peace, unless you wanted to go back into hell. Should everybody read that book?

That's what taking Ayahuasca felt like for me. I don't think it is great to do for everyone. I'm curious to hear your thoughts as you have much more experience than me. I had a lot of challenges after taking it.