A country can be a society, and if that society decides that its dead bodies and their belonging need protection, then so be it. Doesn't seem like the most beneficial thing to do, but you're free to disagree with me. If a dead person's organs can be used to save the lives of others, vigorously protecting that body seems like a selfish thing to do.
Most western societies have rejected your utilitarian thinking, upholding an individual's choices over any forgone benefit to others. For example, every day people die on organ transplant waiting lists, and every day healthy people die in car accidents, but their organs are discarded because they did not check the "organ donor" box on their driver's license application.
