Glad you enjoyed it! I'm not at all an expert on the topic, but I think that in post-war France there was a sudden population boom and they had to quickly build a lot of new homes for the growing population. I don't know if the architects really considered how people would actually engage with the buildings, as they were probably more concerned with designs and costs.
On the other hand, I watched an interesting Alain De Botton video where he talked about the architect Le Corbusier, who wanted to make buildings where people could get to and from work as efficiently as possible. Simplicity and efficiency seemed to be his overarching philosophy. But the problem is that people aren't just drones. They need some stimuli and serendipity in their environments to feel human, and a lot of his buildings now seem so dystopian.
I always get an eerie feeling from Brutalist architecture. I mean, they're interesting from a conceptual point of view, but I'd never want to live in one. They just lack human warmth. Add to that the fact they're often on the margins of cities and have no social mixing while suffering from high rates of unemployment rates, crime and drug trafficking, and you've got yourself a recipe for social dysfunction. I don't think it's a coincidence that Kubrick's A Clockwork Orange features so much Brutalism — it really does feel like the backdrop to a dystopia