Why Don’t we Change?

I am wondering, after all the Millennia that Homosapiens have walked this earth, why we have not evolved from the selfish beings that we are, into a more giving entity?

I am not able to say this any better than in this Youtube Video, so bow to a better authority on this question.

Are we Psychologically conditioned? Why aren’t we free to be the Interconnected Being that preserves life?

Perhaps Jiddu Krishnamurti has the answer?