My random ideas: 1906 San Francisco earthquake, most damage was caused by the fires. Willow's involvement? If she caused the fires, she has a lot of blood on her hands. William Carter found the book right after the train crash. Wickerbottom might have had the book and lost in in the crash. She wants it back? She follows Maxwell into his little demi-plane of Hell. William's brother Jack and his two daughters: Wendy and Abigal? If you look at some of her quotes, Wendy is not a nice person. I think she killed her sister. Wolfgang was part of the circus. His sin is pride (the grand daddy of all sin). WX could have also been a circus act. He has no soul and hates humans. Woodie could have been a patron of the circus. Who knows what evil he caused while under the effects of his curse. Wilson of course committed the original sin of taking (forbidden) knowledge. You can see it in his eyes before he pulls the lever. He knows he is doing something wrong. Maxwell also sought out and used forbidden knowledge. All the characters are guilty of something and were lured, tricked, or trapped into the Shadow Creature's little corner of Hell. (Going into D&D mode, it's Hell rather than the Abyss. The world has order and rules.) Oh and Wes is a mime. That's evil enough right there.