Yellow Stranger
Lurker
He wasn't being brave, it's foolish to put an adult idea to what the boy did. He most likely did it because he saw it on tv and thought he could be a superhero too.
I'm going to have to disagree slightly with you here. What is the difference between a boy dressing up as a superhero, to yes copy what he saw on tv, but the same meaning as his heros when they fight monsters, to a man or woman just taking a bullet. Does the nativity of a child make it some sort of a psychological problem, while the adult get hailed as a brave hero? Maybe I'm not the best judge of this cause I only have a sister five years younger than myself, but I don't see the problem of calling the kid a hero. And maybe while he didn't know the danger he put himself in, I'm sure somehow he was aware of the danger his sister was in. I know four year olds arn't the most experinced humans alive, and while the Tiger situation Mika posted was a good example of such, I also can't believe that a four year old couldn't get the sense of danger to his loved one, especially when a strange man had his sister held up by a weapon and the general sense of distress from his family. Naive they are, but they aren't entirely stupid to those around them.
Yes, he got lucky, but is it not the same for all people who act up in defense of another in a situation like this. People do foolish things in a case like this all the time, but there bravery and reasons for doing something for their family is never foolish.