The real cause is that they disconnected emotions from the truth. Beauty is also disconnected from the truth by the same occasion. Beauty is the purpose of emotions, and when they disconnected emotions from the truth, they disconnected beauty from the truth by the same occasion. And it's intentional, because they didn't have nice emotions, and they didn't see any beauty in their emotions, that's why they wanted to cut off the emotions, and cut off the beauty as well, for them as well as for other people, just to drag them into the same misery that they had to suffer. We can explain things rationally, but the word rational has a root, the root is instinctive and emotional, and the philosophers that conceived this world didn't interpret the word rational this way. They interpreted it this way: Oh, we don't suffer anything like that, we don't have a lack of beauty in our lives, we don't feel any problems or negative emotions, and anybody who pretends that we should have nicer emotions, or that we suffer from a lack of beauty in our lives, or anything like that, are winers, and weak. And they are the problem. That's the story of the devil.