The idea behind a bunker makes some sense as temporary shelter. However, a nuclear bunker feels completely pointless. The luxury "amenities" will cease to function once all the power plants are down. If the bunker isn't located near a farm then you're going to run out of food. You're going to abandon it in the long run. It's a much better strategy to live away from population centres and next to food production. A last minute emergency bunker is practically useless in comparison.