I want you to go to your favorite frontier LLM and ask how much it would cost the US to implement Vienna-style public housing. Figure in paying off current homeowners to get their support. Restrict it to major cities where housing is the worst, just to make it easier. I bet you it's well over $10T long-term. Iraq was $2-3T long term. https://en.wikipedia.org/wiki/Financial_cost_of_the_Iraq_War

You know what? I'll bite. I just went to Gemini and asked this and the answer was between 2.5 and 5 trillion. So less than 2 Iraq wars. Deff a tractable problem if so.