For the next three days we are going to look at the downfall of all those we hold dear. In order for there to be a good emotional impact, there has to be some failure. It makes the triumph at the end that much more powerful.
In world-building for a novel, you don’t want to ask your reader to believe too many big things. Otherwise it gets ridiculous. Now, that isn’t to say that you can’t ask your reader to believe one big thing and then a culture and set of customs are logically built around that one big thing.