kazzerb, you ask: "Why can't "we" use the vast amount of empty buildings which are in every town in the country to house people ?"
Here in the US there's "we" the people- There's also "we" the government- As well as "we" the corporations because they were granted "personhood"-
"We" the government and "we" the corporations are enmeshed- As a result of their enmeshment, long story short, houses and buildings remain empty- Public (we, the people) funding isn't profitable- If it was, everyone would have a place to live-
We, the people, cannot afford to restore the old buildings or move into those that have been cared for- And we certainly cannot afford the new-ish McMansions-
As a result, there's a glut of homes on the market- Mortgage qualification is painstaking, closings are costly- Add to that the sales tax- Even if one could afford to pay 11k in cash for a home, after closing costs and taxes, the total cost of the home would be somewhere in the area of 16/17k-