User blog comment:Crazy sam10/Infinity Ward explains leaving Modern Warfare series/@comment-186.205.239.234-20130531211210/@comment-25496444-20130602003648

I don't personally like censorship, but there are some who don't. Although there's the option to disable gore, it still increases ratings and thus might decrease sales. I think WaW, BO and BO2 were 18+ mainly because of the gore, since the language you can get by (there are many other games with a 16+ rating that have swearing like hell) and there aren't any controversial events.