To think ourselves first before thinking of others is apart of the ego, and is such an animalistic drive. Think about it, what are the most fundamental animal instincts? To survive, and to ensure our genes survive through future generations. Just from looking at that animal instinct, all living things have egos that help them not only be self aware, but do what I mentioned earlier: survive and reproduce. As humans, I feel that one of the consequences of our evolution is our self absorption, which I believe has worsened since our animal days. People are so absorbed by their views, beliefs, principles, customs, etc that they may not even be capable of looking outside of themselves. They may fail to see others' views, beliefs, principles, customs, etc, and remain completely ignorant to anyone or anything else. In so many ways we have evolved, but we are still, as Joe Rogan says, "trapped in these monkey bodies".