I've got an idea -- how about those lawmakers who are so worried about too many people in a living space, start finding out which parents in their cities have too many children? Or which rentals are being occupied by undocumented immigrants living 4 or 5 to a room, and start taking action against them too.
No? I thought so. You don't want to apply the same laws/concerns to everyone -- only to those doing short term rentals.