[zozbot234]

> It’s easy to see why: there already IS enough housing around for everybody.

Maybe in Detroit this statement is true, or a ghost town in the middle of nowhere. The fact that housing costs money mostly anywhere else is trivially evidence that there isn't enough of it to go around.

> Miraculously, the housing crisis has hit all (western) countries on the planet. All of them try to build their way out of it, no one succeeds. Why?

Very few western countries are trying to "build their way out" in a meaningful sense. Folks aren't buying that housing en masse for no reason; they just expect it to become even scarcer and more expensive in the future. If you fail to build any more, that becomes a self-fulfilling prophecy.