That isn't a credible argument. We've known how to engineer for seismic risks for a very long time and many dense, tall cities are built on top of faults in sei

That isn't a credible argument. We've known how to engineer for seismic risks for a very long time and many dense, tall cities are built on top of faults in seismic risk zones at least as severe as San Francisco without issue. For example, Tokyo and Seattle. San Francisco even has the advantage of being merely fault adjacent. In cases like Seattle, a major thrust fault runs through the city. It doesn't prevent dense construction.