Limitations on density are put there by popular demand. Most American's don't want that level of density either. I think they're wrong, but they're the majority.
By their actions, Americans show they want density. Otherwise, why are more Americans moving into big cities than moving out of them? Why do they clog up the freeways by driving to work in the same cities at the same time?
People might say they don't want density, but every current trend is toward more density, because of the actions people are taking.
Someone migrating to a big city generally wants to the last one in the door. People are much more interested in consuming density personally than in in allowing developers to produce more of it.
People might say they don't want density, but every current trend is toward more density, because of the actions people are taking.