"I have the ability to punish you for my fantasy not being true" isn't childish, it's common among adults, and, indeed, is a defining feature among the adults who abuse children and anyone else less powerful than them. It is, in fact, one of the most powerful tools a dictator has: "You failed to capture that objective? You are incompetent, and possibly traitorous, so you will be executed, your family will be executed, and I will continue this war with competent generals who execute my plans because my plans are viable."