I was brought up in a way that when you're at a dinner party, you don't grab a chip unless it's been offered to everyone else. It's the manners of being brought up by English parents. ↗
That survival instinct, that will to live, that need to get back to life again, is more powerful than any consideration of taste, decency, politeness, manners, civility. Anything. It's such a powerful force. ↗