[snowrip]

Second wave of what?

Hyperinflation? Biological terrorism? Power grid collapse? Race war? Financial market collapse? Plague?

These bunkers were meant to protect people from a host of issues that would collapse society, not neccessarily from global thermonuclear war. Even if we went to war with Russia, there would be no “second wave” of ICBMs, because Russia no longer possesses the cabability. Even if they struck first, any reserve strike capability they possessed would be held to counter a strike from a US ally, not to launch on targets that have been empty for 40 years. Sheesh.

[RavenLooneyToon]

So buy a shelter in case of something other than a thermal nuclear war? I would think the idea behind having a shelter would include nuclear war as a distinct possibility.
There would not only be a second wave, there would be third wave and more. Russia is not the only possibly hostile nuked up entity. Some of these entities actually know how to fight a war with reckless abandon and without mercy.
They have no false illusions about nation rebuilding.