In other words, they are not real things. Re-read my post:
Good and evil arnt real things. Theyre interpretations based on human judgement. "Good" and "evil" are concepts created by man to understand the difference between acts of pure selflessness (which isnt possible but Im saying if there was pure good than it would come in the form of pure selflessness) and pure selfishness (which is also impossible as there is always some good intention behind everything). The closer something is to pure selflessness, the more it appears to be "good" and vice versa(keeping in mind that everyone has a different perspective to whats good and whats evil).

This judgement is a humans survival technique. Being with someone of "good" nature may not improve your survival (succcessful survival) chances but it would be a lot worse for someones survival if they were to hang around someone of an evil nature.