It's not that allowing development is then reason that prices go up and cause people to be forced from their homes. It's that the developments themselves won't

It's not that allowing development is then reason that prices go up and cause people to be forced from their homes. It's that the developments themselves won't sufficiently increase the supply to the point that it would prevent the rise in housing costs, so they'd rather that development not get built at all because they have other, aesthetic or cultural objections in addition to that. Again, complex interlocking factors. Not denial of economics.