Complaining about a lot of things to do with fiction is dumb because the story isn't going to change anyway. But it's still fun LOL. Being beaten daily, often not fed, and locked in the dark for most of your life does not a well-adjusted and healthy 11-year-old make. And yet Harry is one is HP1. So arguments about what the character do will almost always be based on what a reader wants to see and not always what's realist.

And they're fantasy books. Fantasy implying that the person reading them doesn't have to be looking for realistic depictions of human interactions. Fantasy is a means of escape and it can be as as unrealistic as possible as long as it fulfills a reader/writer's desires.