Because it was written in what is known as the “apocalyptic” style. Apocalyptic literatures was deliberately written in such an esoteric way that it would only be understood by its intended audience.
The Book of Revelation (Singular “Revelation,” not plural “Revelations”) used poetic allegory and coded images to communicate a message of hope to the faithful that would not be understood by casual Romans. The whole book is about the persecution of Romans under Domitian and God’s coming vengence against the Roman Empire. The “Whore of Babylon” was Rome, the “Beast” was the Emperor (in this case basically a combination of Nero and Domitian. Domitian was widely believed at the time to have been Nero in disguise). Revelation told Christians to hang tough and that Jesus was going to come back and kick ass against the Romans. To an average Roman soldier, though, it would all just look like hallucinatory gibberish.
DtC- I agree that the Revelation was written to encourage C’tians under Roman persecution, but do you really think a Roman reader, especially a Gov’t official, wouldn’t have figured out that blood-drunk Whore on the Seven-Headed Beast that represents a City on Seven Mountains has something to do with the Roman Empire?
But then, I actually think the Whore was Apostate Jerusalem, the Beast was Rome (represented by Neron Kesar aka 666) & that John wrote in the early 60sAD.
The majority of current scholarship puts Revelation in the late 90’s near the end of Domitian’s reign. Eusebius wrote than John was banished to Patmos during Domitian’s reign. The interpretation I outlined above is actually the interpretation of the Catholic Church.
Then again, maybe John of Patmos just happened to nibble some bread with lots of ergot in it. Or some Persian or Indian funny-mushrooms or whatever they used to make soma or haoma. Or maybe he was into to the extreme monkish austerities – too much of those could put some really funny ideas into your head!
Given that Revelation was written rather well in a specific style that followed a specific format–a style that was incorporated into numerous other works by several other authors–the notion that it is simply the result of a drug-induced frenzy, while mildly amusing, fails to recognize the actual intent or effort of the author.