If Juliet is inactive, she's probably scum. If Juliet isn't checking her own name for people who suspect her, she's probably scum. I haven't seen a single post of hers this game so far.
As for Nick, I generally trust Flower's read on him. She seems to suspect him, and of the handful of posts I've seen from Nick he has been different in that he isn't trying to do anything this game, but I've been much the same on that point too. Null on him but there is equity for scum here.