A problem usually must be accurately identified to be fixed.
Blame the private equity companies that bought all the housing.
At least at this point it is a drop in the bucket. The issue with housing is zoning, not enough supply of affordable housing, and the singly story sprawl which makes land in proximity a bit too valuable. Granted, the last point is true even with apartment complexes in hot areas.
To make it short, the main issue with housing is that it is considered an investment and not a commodity like a car.
Blame the politicians who failed to stop it and the voters who failed to convince the politicians to stop it.