Earlier quoted context omitted.
> armies We tend to give medals to soldiers who self-sacrifice, because it's unusual. Not many are interested in dying for their country. If you refuse an order to advance on an enemy stronghold, you'll get shot. Remember those Soviet blocking battalions? How does that relate to self-sacrifice for the collective? You overlooked the rest of what I wrote about armies.
> Not many are interested in dying for their country. If you refuse an order to advance on an enemy stronghold, you'll get shot. Actually, what that shows more than anything is that not many people are willing to kill for their country. Killing other humans, even in self-interest, is often very hard to do - this is actually further evidence that people are quite collaborative and non-confrontational by nature.
Once again, I must emphasize that being motivated by self-interest usually means collaborating. That's how free markets work - collaboration among self-interested people.
Collectivism is about self-sacrifice. Sure, you can find people willing to do that. But not enough to structure society around it.