Why believe the bible?

[Fake Messiah]

De Waal's own words from a New York Times article.

https://opinionator.blogs.nytimes.com/20...thout-god/

At the same time, however, I am reluctant to call a chimpanzee a “moral being.” This is because sentiments do not suffice. We strive for a logically coherent system, and have debates about how the death penalty fits arguments for the sanctity of life, or whether an unchosen sexual orientation can be wrong. These debates are uniquely human. We have no evidence that other animals judge the appropriateness of actions that do not affect themselves.

That doesn't mean that he thinks chimps don't have any morals. It is like saying that chimps don't have a language, but it doesn't mean that they can't communicate. Because human language is so more complex that chimp's language fades in comparison. Indeed in the video I posted he claims animals have compassion and love and altruism which he calls pillars of morality.

As he writes from the article you cite:

For example, female chimpanzees have been seen to drag reluctant males towards each other to make up after a fight, removing weapons from their hands, and high-ranking males regularly act as impartial arbiters to settle disputes in the community. I take these hints of community concern as yet another sign that the building blocks of morality are older than humanity, and that we do not need God to explain how we got where we are today.