Well, What About an A-Bomb?

I know that in certain movies, you can not invade them with certain systems of logic if they function on other, distinct systems of logic. For example, a movie about magic (or majiiiqcck as new-agers say) can not have science brought into it or it all breaks down.

Unfortunately, movies about magic are frequently brought together with modern times. Harry Potter is a good example. Yeah, yeah. All the wizards at Hogwarts are very powerful, but, could they stop an A-bomb? Or, again, any one of the 93,476 modern-day vampire movies where vampires are loaded with bullets and knives and whatnot but keep coming. Well, what about an A-bomb? Like the Grand Poobah vampire in John Carpenter's Vampires, what would have happened if he got nailed with Fat Man.

I'm sorry, but this is actually a knock against movies, for me. If the movie is set in modern times it must be subject to the rules of modern times. Like the bus that picks up Harry Potter in the third book/movie. It frantically dodges people on the road as it drives around at warp 5, and it's explained that people don't see because they choose not to see. Well, yeah, but the bus is still physically there, in some way. So whether they can see it or not they could still walk into it. And what about the tracks that carry the train? Do people just not notice them?

My favorites are still vampires, werewolves, and other such ergot-inspired delusions. I guess ol' B-Dogg Stoker didn't imagine A-bombs. What's more, he didn't need to. But now, if you're writing a movie about magic, vampires, or perhaps magical vampires, I beg you to ask the question, "what about an A-bomb?"