If it's a good book, anyone will read it. I'm totally unashamed about still reading things I loved in my childhood.

I forgot Dumbledore trashed Hogwarts, refused to resign and ran off to the forest to make speeches to angry trolls.

Dumbledore will only leave from Hogwarts when there are none loyal to him!

Harry felt winded, as though he had just walked into something heavy. He had last seen those cool gray eyes through slits in a Death Eater’s hood, and last heard that man’s voice jeering in a dark graveyard while Lord Voldemort tortured him. He could not believe that Lucius Malfoy dared look him in the face; he could not believe that he was here, in the Ministry of Magic, or that Cornelius Fudge was talking to him, when Harry had told Fudge mere weeks ago that Malfoy was a Death Eater.

The wand chooses the wizard.

You can exist without your soul, you know, as long as your brain and heart are still working. But you’ll have no sense of self anymore, no memory, no . . . anything. There’s no chance at all of recovery. You’ll just — exist. As an empty shell. And your soul is gone forever . . . lost.

I don't think there's any harm at all in allowing a kid to fantasize. In fact, I think to stop people from fantasizing is a very destructive thing indeed.