When Petunia Dursley refused to take Harry in she forfeited his birthright protection, so Dumbledore took the baby to the safest place he knew: Hogwarts. The applicable staff (mostly just… not Snape) took Harry in on a rotating schedule as he grew from baby to toddler to child. They traded extra credit for babysitting among the older students, and Harry grew up knowing a few dozen different laps that were safe and warm to nap in. This was a Harry who grew up among books, among old transient walls and learned professors. They gave Binns night duty sometimes, and let him talk young Harry to sleep. This was a Harry whose world changed, on principle, daily. The stairs moved. The walls became doors. You had to keep your eyes open–you had to pay attention. So he did. He grew up in a school. Knowledge was power, but knowledge was also joy. This was his sanctuary. There was magic in his world from birth.

Slytherins–- this is a group who laughs when Neville falls off a broom and breaks his wrist. And what if we had Harry there, who had always been the one laughed at, who had a nice thirst to prove himself, who had green trim on his robes instead of red? This Harry still stepped out in front of Malfoy’s best sneer and demanded Neville’s Rememberall back–- though he got a detention from it, not a Seekership. When kids in the Slytherin Common Room tossed jeers at the pudgy feet of Millicent Bulstrode, Harry rose up to do something about it. When Quirrell shouted “troll in the dungeons, thought you ought to know,” and Harry overheard that there was a girl in the bathroom crying, he still ran off to make sure she got out okay. Harry did not ask Millicent to come with him; this was not a boy who asked for things. When he had asked for things, Dudley had laughed, Petunia had scowled, and Vernon had said, “no,” or just kept reading the newspaper like he hadn’t heard anything at all. But when Harry went, Millicent bunched up her robes in her hands and followed.