That's the thing we're trying to explain them for quite some time now. That if you're caught in such a situation, where you have no other choice, you'd have no other option than to eat that human meat in order to live long enough to see the help come.
But then, I guess there will be some people who would rather starve to death. And BTW, there is no guarantee that you will stay alive for a long time, even if you eat a dead human. What will you do once the meat is finished? Also, the meat can't last longer than 1-2 days, as it will decompose.