Human history is full of group selection n. Every time one group with better technology or social organization pushes another group off of its land, that's at least group selection n.

It might make more sense to think of one technology or one form of social organization pushing others out of existence. Human beings (and the rest of the environment) could be thought of as the resources used for propagation.

In this context group selection seems like an obviously important idea for understanding certain salient phenomena.