Even if shelters had absolutely no protection from blast they would anyway did most of the job they were intended to do: protect from fallout. Just a few days o

Even if shelters had absolutely no protection from blast they would anyway did most of the job they were intended to do: protect from fallout. Just a few days of shelter time will cut number of casualties in half. Also today's nuclear weapons are in general, weaker than those of 1950s, especially late 1950s. Weirdly, this means that shelters give somewhat LESS protection because fallout is less of a factor than blast and prompt radiation (you probably can't get in a shelter in time to avoid prompt radiation).