“Let me be represented as one who trusts his senses, who thinks he knows the things he sees and feels, and entertains no doubts of their existence.” -- Bishop Berkeley
The title of this post is definitely quotable material. It neatly sums up in one single sentence one of the problems (if not THE problem) with rationalistic, let's-replace-everything-we-have-with-this-great-system-I'tve-come-up-with ideas to improve the world. It made me think of the French Revolution. I'm not sure that was your intention. But it does fit nicely in the context of several things you've been writing.
Yes, the French Revolution is the paradigm of the phenomenon the title describes.Yes, please, let's make step-by-step improvements in what we've got, and not think we can build a new society from scratch!