There is no contradiction. We can all be altruistic or nasty depending on the context. We are messy and complicated animals, and we cooperate or defect dependin

There is no contradiction. We can all be altruistic or nasty depending on the context. We are messy and complicated animals, and we cooperate or defect depending on many signals. For those interested in this topic in depth (not just anecdotes like in the article) I recommend Behave by Robert Sapolsky.