[ZoeZoeBee]

Yes Detroit has demolished thousands of buildings over the last decade. Other than that your entire take on the situation is a simplification of a much larger problem which will not be solved by just applying the idea of "let people live in them".

An "unused" home does not simply sit in pristine condition waiting for the next person to come live in it. The abandoned homes in Detroit slated for demolition were built during a period which used lead paint and asbestos, abatement programs are expensive. As the homes sat unused they fell victim to scrappers who pull the copper pipe and wire from the wall, strip all of the architectual details, rip the aluminum siding from the outside, or knock down the brick facade, before the house eventually falls victim to an arsonist who may be doing their neighbors a favor. Most of the homes lie in isolated neighborhoods where burnt out buildings outnumber humans. When the homes are bulldozed they're not rebuilt, rather whole neighborhoods are set to be depopulated so city services can be better concentrated. This isn't a simple "profit" play, it is a coordinated downsizing to deal with reality