I like the book version of that scene better. Johnny is talking to his new grandfather-in-law (his dad remarried), who is a WWI vet, and asks him the same question... and the old man takes out his pocket knife, and Stephen King goes into how the old man had the same knife with him in the trenches, and how most of his comrades were killed by the machine guns and the mustard gas, and how it had all been for nothing, and the old man had lost his son in WWII, because of Hitler... and the old man says that he'd stick the blade in Hitler's black heart, and twist it a few times, but that he'd coat it in rat poison first.