Aberrforth Dumbledore is a Death Eater

The following was written in an email to Mugglecast about a theory regarding Aberrforth. I listened to that Phoenix Wright "OBJECTION" song on repeat while writing this. Can you tell? I have not listened to the latest podcast episode yet, so if someone has pointed this out already, I apologize. Here's my theory: Aberrforth is a death eater. Note: When I refer to "Dumbledore" in this theory, I mean Albus. This is out of habit of course. When you were going over the fine details of Aberrforth in episode 53, I started to notice the striking similarities the "in the background" Aberrforth shared with Professor Quirrell in book 1. Someone who J.K. Sneaks in as a minor character who has a major role in the climax. Here are some examples from the books: 1. What we thought happened: Aberrforth saw Snape eavesdropping on Dumbledore, and barged in to show him. What could have happened: Aberrforth was, in fact, eavesdropping on Dumbledore AS WELL, and used Snape as a scapegoat. 2. What we thought happened: Mungdungus was looking for some extra cash, and sold Sirius Black's stuff. What could have happened: Although Mundungus had no clue that he was selling a potential horcrux to Aberrforth, Aberrforth may have known. Now, you might think, "why wouldn't Dumbledore know about Aberrforth being on the dark side?" Well, perhaps Dumbledore did, but refused to act on it, or believe himself. The following quote is from J.K. Rowling herself: "But I would say that I think it has been demonstrated, particularly in books 5 and 6 that immense brainpower does not protect you from emotional mistakes, and I think Dumbledore really exemplifies that." Now here's something interesting: if Snape is innocent, then what emotional mistakes has Dumbledore made? It could be that he turned a blind eye to Aberrforth. In conclusion: "You have a slightly circuitous answer, but I can't get much closer than that." -Quote from JK regarding Dumbledore's emotional mistakes.