This Harry Potter fan theory about the Hogwarts class size will wreck you

Have you ever noticed that the number of students in Harry Potter’s class at Hogwarts is insanely low? Well, as always, there’s a fan theory to explain that — and it’s quite dark indeed.
But first, let’s start with some math. We know that there are five boys — Harry, Ron, Neville, Seamus, and Dean — in Harry’s dormitory. So, assuming there are the same number of girls, that means 10 Gryffindors in Harry’s class, which means 40 total with each of the classes. A pretty low number, right?
The mystery only deepens when you consider than in an interview with Scholastic in 2000, J.K. Rowling said there is a student body of about 1,000 at Hogwarts. In the books, Harry notes at one point that three-quarters of the students present at a Quidditch match were supporting Gryffindor, and 200 were supporting Slytherin, which means there were about 800 present. None of it adds up, does it?
Although it’s certainly possible that J.K. Rowling had some continuity errors — and understandable, since she’s given countless interviews over the past decade-and-a-half — one Tumblr user has a very chilling theory to explain the mysteriously small Hogwarts class.
One week ago, Tumblr user marauders4evr shared his or her Harry Potter fan theory and it’s been going viral:
If this Harry Potter fan theory is true, then the seemingly low number of students in Harry’s class isn’t a continuity error at all. Instead, it’s due to bloodshed and destruction at the hands of Voldemort and the Death Eaters.
Yep, we are officially wrecked.