
Building on the ethological evidence, this book engages in meticulous philosophical analysis and argument, and decides that animals can indeed be moral. Animals can act morally in the sense they can act for moral reasons. Or, at least, they are no compelling logical obstacles to supposing that this is the case. This conclusion has important implications not just for our understanding of animals but also of the central concepts we employ in understanding the moral lives of humans, such as motivation, action, and agency.
https://www.amazon.com/Can-Animals-Moral-Mark-Rowlands/dp/01...
Also Analysis of the Self by Kohut
https://www.amazon.com/Analysis-Self-Psychoanalytic-Narcissi...
which is difficult going but helps draw a circle around the concept of "self-centeredness"
I think the concept that animal can be moral / immoral is already a philosophical subject. See the book "Can Animals Be Moral?" for reference.
And in order to say that these monkeys are evil, you must first prove that they can be moral.
