

I think it’s a great idea to show how the Dark Lord isn’t prejudiced in the muggle way, judging people for their gender, sexual orientation, or the colour of their skin, but rather their blood purity only. A black pure blood is obviously superior to a white mudblood.
This is a non sequitur. You need a better reason that that if you’re going to restrict child communication and security at a place they’re commanded by law to go all their childhood.