I'm sorry to see you get down voted, but I share your sentiments and agree that it was something that could be reasonably called a conspiracy. Unfortunately it has become part of the intellectual furniture of left-wing ideology, which makes a lot of otherwise perfectly nice people support extremely inhumane building patterns.
Some books on the topic that I have read, if you haven't are:
A funny side story: I realized I was some sort of reactionary my freshman year at Berkeley, when I was standing in the memorial glade, swinging my gaze back and forth between Doe Memorial Library and Evans Hall.
It always makes me feel like one of those "I wish I lived in the past!! The present sucks!" people but IMO arts, architecture, city planning, and aesthetics went downhill after WWII. I'm not sure why or how but that's how I feel.
Honestly, I would rather live in a Brutalist house than a McMansion. At least it might be competent in both architecture and construction, if a bit eccentric.
Most of the examples I can find online of Brutalist homes are actual mansions, however, so it's hard to compare apples to apples.
Some books on the topic that I have read, if you haven't are:
https://www.amazon.com/Bauhaus-Our-House-Tom-Wolfe/dp/031242...
https://www.amazon.com/Old-Way-Seeing-Architecture-Magic/dp/...
https://www.amazon.com/Geography-Nowhere-Americas-Man-Made-L...
A funny side story: I realized I was some sort of reactionary my freshman year at Berkeley, when I was standing in the memorial glade, swinging my gaze back and forth between Doe Memorial Library and Evans Hall.