If there is no God, the labels 'good' and 'evil' are merely opinions. They are substitutes for 'I like it' and 'I don't like it.' They are not objective realities.
To deny that human beings are filled with anti-social passions betrays a denial of reality and a lack of self-awareness. One has to be taught nonsense for a great many formative years to believe it.
The world is a bad place. There are many wonderful people, but on the whole, humanity basically stinks.
Since the 1970s, I have asked students if they would first try to save their drowning dog or a drowning stranger. And for 40 years I have received the same results: One third vote for their dog, one third for the stranger, and one third don't know what they would do.