Episode 2: Altruism v Darwinism

In this episode I go over some articles that look into the evolutionary benefits of altruism and selfless acts over selfish behaviors. Does this directly contradict Darwin's "survival of the fittest", or is it just a different side of the same coin? Sources: https://stanford.library.sydney.edu.au/archives/spr2008/entries/altruism-biological/ and https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5456281/