I sort of agree that there's no need to put ball out unless ref blows whistle, there's no need, I'd make an exception if the ref is a while away and the player has seen it's a real nasty injury first.
I however am not really sure we want to develop a mean streak, it can help some teams for sure, but we seem to have a pretty likeable bunch of players who don't whinge too much and it seems to contribute to team spirit etc. Cabaye has a bit of a mean streak already anyway and I worry about it cos it gets him in danger of red cards without benefit. I wince when I see suggestions to injure other teams players, that's not us.