Millions of people eat McDonald's hamburgers every day and we all understand why that drives the price of hamburgers down, not up. Demand doesn't make prices go up all on its own. The problem isn't demand; it's supply. The lack of supply is a policy choice -- emphasis on choice*; it's not a natural law -- and you've located the blame 90 degrees to its actual cause: existing homeowners* who benefit by restricting that supply.

People should be mad, but not at 22-year-olds coming from around the country looking for work. They should be mad at the millionaire rentiers who tell those kids when they show up that it's illegal for anybody to build them housing.