They possibly did! At least this time, their pairing actually became canon. If that's healthy is a completely different question. :D

Not for Mohinder/Sylar, no, but I've already seen posts bemoaning shows which romanticize bad boy relationships, and they listed Hannibal among others. I mean, I've watched the show, and while I'd argue that Bryan Fuller's relationship with the character is certainly *special*, anyone thinking that Will/Hannibal is meant to be positive and unproblematic is really sticking to the surface. (That, too, is an annoying aspect of tumblr - the idea that fiction has to either spell out a specific moral, or it is utterly endorsing everything that happens. Interpretation and making up your own mind about something is apparently too difficult for readers and viewers these days.)