It's unfair for anyone to name Micah Richards here.
It wasn't his fault he was offered so much money on such a long contract and was simply unable to return the faith put him in; he's spoken about this brilliantly. His body couldn't cut it anymore for the demands placed upon it, it had nothing to do with attitude. There was simply no more football left in him, as even Steve Bruce recognised. He had no chance of a contract at any other club in any league, and it's plain stupidity to suggest he should have 'honourably' stepped away from his final ever contract as a professional footballer.