There is not one player in the NBA or any league who should ever be tanking. If they are, then they don't belong in the NBA. Tanking is a coaching and front office thing. When it comes to the players on the court, I want them laying it all on the line even if Michael Jordan is in the draft.
As for Melo, he still has to lead by example. If he's going to just tank on the court then why shouldn't Willy or Kuz, who are fighting for careers and better contracts still?
“Whenever I’m about to do something, I think ‘Would an idiot do that?’ and if they would, I do NOT do that thing.”- Dwight Schrute