I mean, we haven't even established whether ultimately Cabrini-Green was a good thing or a bad thing. You gave a long list of problems, and it sounds like it was a miserable place to live, and it hindered economic development for some of the surrounding area... but even the later parts of the wikipedia article you link note how the residents considered it preferable to being homeless (their likely fate without it) and lobbied to keep it standing. I don't know, suppose we did it again and everything happened exactly like it did before, but also 15,000 people had a stable home they could call their own for a few decades (no matter how ill-repaired and unpleasant) instead of being homeless. I think whether that was a success or failure would be a matter of analysis, not obvious, and of comparing against alternative ways the money could have been spent. And maybe with some "lessons learned" everything wouldn't happen exactly the same and there could be an iterative improvement.
I mean, we haven't even established whether ultimately Cabrini-Green was a good thing or a bad thing. You gave a long list of problems, and it sounds like it was a miserable place to live, and it hindered economic development for some of the surrounding area... but even the later parts of the wikipedia article you link note how the residents considered it preferable to being homeless (their likely fate without it) and lobbied to keep it standing. I don't know, suppose we did it again and everything happened exactly like it did before, but also 15,000 people had a stable home they could call their own for a few decades (no matter how ill-repaired and unpleasant) instead of being homeless. I think whether that was a success or failure would be a matter of analysis, not obvious, and of comparing against alternative ways the money could have been spent. And maybe with some "lessons learned" everything wouldn't happen exactly the same and there could be an iterative improvement.