[jltsiren]

Most of the complaints against density are really against medium-density cities. Those combine the worst of both worlds. They don't have enough room for cars if most people drive, but far too many people have to drive because there are not enough people to support decent public transport on most routes. Once population density starts approaching something like 10k / square km (25k / square mile) over large enough areas, urban life becomes much more attractive.

I've never been to Seattle, but it looks like a medium-density city on the map.