There seems to be a suggestion that a player who has been tripped or pushed ought to stay up, if at all humanly possible, and that if they go down that's cheating. The point is that those actions - pushing an tripping - mess up what the players was trying to do, and that is where the cheating lies.

It's better for a player who has been fouled to go down than to overdo the efforts to stay up like Rooney did, and risk causing serious injury to another player by stomping all over them in the process.

The term "diving" should be restricted to the situation where a player trips themselves up, or decides to fall over, when there has been no illegal contact, and then pretends that they have been fouled. That of course is cheating, as is the case where a player feigns injury to make matters appear more serious than they actually are.