Amianki, why do you think BT is scummy? I couldn't find anything that seemed off for him and i'm curious to see what you're thinking there.
I stopped taking notes after page 4, but the one specific example I jotted down about him before that was this post, which is a remarkably different stance from what he posted here. I can't find any reason that would prompt this switch and it's so unnatural that it doesn't look like town trying to further the game.
Otherwise, a lot of it is just his general posting. He looks like scum trying to do the minimum to keep afloat in the game, yet he's still paranoid that what he does say will make people suspicious of him. His scumlist post and response to Fates afterwards regarding it is the best example of it.