In the beginning stages of the Cold War and the start of urban sprawl the threat wasn't rockets but bombers. ICBMs weren't created till '57 and took over the st

In the beginning stages of the Cold War and the start of urban sprawl the threat wasn't rockets but bombers. ICBMs weren't created till '57 and took over the strategic setup for killing everyone in the years after that, so there's a window there for sprawl to be a legit(ish) survival/mitigation strategy.