It's believable though. Oil isn't only useful as energy source. Also it's quite possible that US only recently began producing energy cells and these quantities still didn't cover public demand, as most of them went to the military. Nuclear powered cars only began being manufactured (contrary to...
It's really weird not to use nuclear power for vertibirds or other aircraft, since Mr. Handy uses vertical electric fans powered with a nuclear battery and can hover for years. They do have compact safe nuclear power as seen with microfusion cells, nuclear cars and power armor.
In my playthrough Killian was stunned or something during the attack, he was alive and standing, but the only interaction I could have was loot his body. Waiting for a day didn't help.
I totally support the oldschool system. I am actually sort of okay with the new minigame, but it gets old really quick. They should've made it always possible to play the game but it to be incredibly, just impossibly hard if you have no skill and lock/pass is too hard. And if your skill...