It's because the last section of the Dead Ends was explicitly the end point of ancient society. So much so that the dev team confirmed it themselves. How can you look at how a utopia ended and not think "that society I visited early that was aiming for a utopia would end like this." You'd have to not be paying attention to not make that connection. And if not, you've got some interesting delusions about how a utopia would be.
If it doesn't apply to you, I'm obviously not talking about you am I?