Dan,

I don't disagree with anything you said. Of course altruism exists. Of course, it is explainable by evolution.

My problem is semantic. The other fellow asserts that Natural Selection works at the level of the individual. He is not alone, as I have heard many others assert the same thing. In fact, I also would agree with that statement in most cases. However, I'm not sure that is a correct characterization of what's happening in the case of the development and propagation of altruism.

I'm not sure the schooling of fish is an example of altruism. This balling probably tends to shock and confuse predators. Individuals who survive will be able to transmit genes through their own gametes and not through a tribal proxy.