They havn't cancelled their order. They're just BSing like people do w/ Sniper Lobbies for example, pointless BS. Now the tabloids, they'll have a field day w/ this if they want to but people need to realize it's just a game, for 18+, so if a parent buys it for the child it is the parent's responsibilities that their kid doesn't get messed up(chances are if he does though, he already was) and not the developers, in this case IW.
P.S. Are parents not able to tell how mature their child is? So little so that they complain when he gets aggressive. The kid probably gets aggressive because the buggers in the lobby are calling him a fag etc lol, in which case it's peoples' fault, not the game's!