Again thats no real argument is it. Of course Arsenal players have caused injuries to other players, it's part and parcel of the game, However I certainly don't remember at Arsenal player in recent years going out with the intention of hurting another player, which is what is being suggested here.
Or are you trying to suggest every time we see a bad career threatening tackle go unpunished we can say its alright because that club has had a player injure another player before. Right....
You do realise the only reason Wenger is mentioning Legal action is too push the FA/UEFA/FIFA to do something.