Added 2 minutes later
Well, I wouldn't trust the note, because Arkhangel himself was Arandor. What's the point for him to incriminate himself with a note?
Take a closer look at the blocks. In both nights, when they were, all the peaceful NDs are in the newspaper. So both are mafia.
Added 15 minutes later
Well, I would still risk executing the maniac. I still think it's Lynx. I don't see another explanation for the clue yet. The blues will just go and kill her, as if. To lose another one of their own? Yeah, twice. So execute Lynx. And we'll deal with Ment at night.