In short, I'm pretty convinced by Luca's decimation of Proffi. His early posts were very friendly and generous on the town-reads. Voted for me because my join date (2007) indicated I was new. No hint of any suspicion of anyone until the heat got turned up - every other post had been defensive and trying to avert suspicion. From post 150, appears he has basically given up, which seems really premature. If he is scum, certain he is being bussed hard, otherwise he'd have a bit more fight.
I took the bait in proffi's post 195 and read a game in which he was town (non-mason) - Mini Normal 2107.
Much more engaged in scumhunting from the outset, obviously thinking about behaviour of other players, no hesitation in throwing shade, and trying to join the dots between everybody. Conspicuous pro-town behaviour. Also interesting is a bit later in game, when he gets some heat (like here) - he eventually does become defensive like here, but it isn't immediate and instinctive, and he resists for a while because (as he explains) he doesn't want to distract from his own genuine scumhunting by just getting into a debate with people who suspect him.
Also I have to share this from Proffi in Mini Normal 2121:
"I dont like when people sit on day 1 and complain that they cant find anything scummy as it's usually scum being incapable of faking a read."