Frankly I think too many people are overly concerned about people being offended and not concerned enough about keen insights about the current state of affairs. I only wish the US papers would grow a spine and a set of balls and publish them. If you don't like yourself being viewed in such a way, do something to change it.
Unfortunately, all of Islam has allowed itself to be hijacked by the extremists by failing to denounce their actions. The cartoons are depicting a reality and an insight that is little short of brilliant. This is what political/editorial cartoons are meant to do, not "objectively report the news".
Unfortunately, we need to shed our excessive touchiness too, and see the Rumsfeld cartoon for the insight it presents rather than getting offended so easily.
Screw sensitivity training. The world needs desensitivity training.