>(People laying down in front of tanks, etc.) There are a couple ways to handle this. First, humans are not inherently rational. How many times does a human

>(People laying down in front of tanks, etc.) There are a couple ways to handle this. First, humans are not inherently rational. How many times does a human desire one goal but performs something that moves that goal further away from them, perhaps to the extent they destroy any hope of obtaining that goal? Second, there are social benefits to selflessness that we will tend to be able to enjoy the benefits of but which are not always going to be there. Consider a bird trained to press a button for food though the food only has a chance of being produced. Even in cases where there isn't food, the bird is still pressing the button to get food. Even when an outside observer knows the next press will not generate food, the bird is still pressing it for food. Even if we could inform the bird that food would not result from the next press, the bird would likely make the decision anyways to disregard our advice and press the button for the sake of food.