Where did you read he said he was proven guilty? Are you trolling? I don't think you read that correctly. He was probably one of the men that was selected to stand in front of the one way mirror and he found that offensive and I personally found that completely understandable. I mean just look at your post, you misread and automatically went for the guilt, as if anybody would confess to being a convicted rapist on this forum.
Why it is offensive? Because people who have nothing to do with the case shouldn't get selected unless there's a real doubt about their innocence cause otherwise assholes like you immediately jump to the conclusion that because they're even part of the investigation then they must be guilty. And that's the kinda shit that can potentially ruin lives.