Board Thread:Monster Discussions/@comment-26155014-20150712123810/@comment-7622429-20150712180541

Plus, he grew up surrounded/influenced by Humans. He acknowledges their existence, actively interacts with them. Heck, in GvsD, he protected us consciously. Even if his latest memories from dying and then his father dying are quite traumatic and have an effect on him later in life, he's still got his connection to Humanity, which would likely be his moral compass.