We, The Self Sacrifing

"To put it in a slightly more respectable way, a group, such as a species or a population within a species, whose individual members are prepared to sacrifice themselves for the welfare of the group, may be less likely to go extinct than a rival group whose individual members are place their own selfish interests first. Therefore the world becomes populated mainly by groups consisting of self sacrificing individuals." pg 7. So making sacrifices for others is what at the end will give out prosperous results. Not thinking in our personal benefit but rather thinking in what is better for a lot of people would hypothetically end up helping us overcome other species on earth. The different species, like bee's, seem to give up their own lives in order for the rest o the hive to be able to survive. When individual species seem to think in only their personal benefit, only those few individuals live while the rest die out. And then we come into the game. But did we really follow this method for overcoming other species on earth?
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We as humans rarely think in giving something up for the benefit of others if it's not for a reason that will give back results for something that benefit us. Now we believe that in order for us to give something, it must be for a good reason, and many times hesitate if its just for the well being of others with no sort of pay. But in the past it was that unity which lead us to develop. While coming together in groups and relying on each other for protection, we developed together to watch each others backs. Now a days though, we now have overpassed the limit in which other species begin to evolve, and therefore that unity we had might be lost. With modern technology and the security we have taken, we now "rarely" have to go out and fight in packs against a bear in order for us to eat and survive. Our abilities have taken to relly less on others and more on the things we have, taking us to think more on our welfare than on the welfare of others.