I love this:
The thing is, I can conceive of a progression and reason to get to these things. Inventions fall under the same category. But how did a purely natural species conceive of a spiritual realm?
tec: good one :) glad you enjoyed your trip. Sorry to hear about the drive though.
What makes something mass hysteria? Is it because all the witnesses witnessed something supernatural: therefore they didn't witness it? Even when there are repeated circumstances? And when there are people who are physically altered after?
For a moment, for the purpose of this next argument, let's say that pink unicorns are in fact real. Although the general population do not know about this (the same way we don't all know you are wearing a pink t-shirt). You and 1,000 other people see this pink unicorn. You document it. Then the pink unicorn shows up more then once, another few thousand see it people see it. Then the pink unicorn dies or moves away. She doesn't come around anymore. You and some 5,000 + share with the world: "YES! I saw a pink unicorn. I documented it. I can validate it with other witnesses."
The world will not believe you. Mass Hysteria.
Then 100 years passes. Another unicorn shows up, only this one is blue and it shows up in another country and to a new group of a few thousand people... same things happen.
The world still doesn't believe you: Mass Hysteria, even now that it happened twice...
If something supernatural such as unicorns did in fact exist: why wouldn't people believe you if these things happen? Or would there be some people who did believe you? Would they be crazy to trust you (and the few thousand witnesses)? Or do they only not believe you because it is outside of their perception of the world? The fact that they can't perceive it being possible wouldn't change that it happens.
Isn't this similar to how we know our history? Before video camera there are history books: don't we get our facts that events happened purely because they are documented and there were witnesses?
Why is it easy for us to believe what we hear on the news as fact? Or a slice of life story a person tells you that happened to them? For instance if I tell you I went to a college lecture and there were some 50 students who heard the professor speak. If I told you the professor existed and gave an interesting lesson. I don't have it video taped. I have far less witnesses then the Marian Apparitions. The professor will be dead before another 100 years passes. There will not be a repetition of this event because I will not take this class again. However if I were to tell you that you that it is more likely you would believe me. Why? Because it doesn't conflict with your perception of reality. However both Marian Apparitions and professors that you never meet for yourself depend on taking someone else's word for it.
What about a sole eye witness to a crime? Should they take the stand in a trial? Should a jury believe them? Or should it be dismissed as hysteria? If there were 100 people to witness the crime then it would be mass hysteria... but no, we trust witnesses... because if they say something it is in our realm of understanding, in our world of perception.