Earlier quoted context omitted.
> Peers are supposed to know you, your character, and your history. I don't think so. It's one thing to say that juries should be made of private citizens drawn from your nation/state/town. It's another thing entirely to say that juries should be made up of your buddies. Peer is not a synonym for neighbor. It means "equal".
They are just as supposed to know the victim, their character, and their history. There's no reason to suppose that a "close peer" jury would favor the defendant , it's just as likely to be the other way around.
Edit: To be clear, I agree with your premise that knowing the defendant does not necessarily bias a jury in favor of the defendant. I don't think there's any reason to assume the jury should have any knowledge of anyone, though. In fact if you do, you'll probably get removed from the jury.