Working with my story of T.H.S, which is purely nothing but the lives of demons, one of the most important questions surfaces early on: What do we mean by demons being evil?
Since good and evil is subjective, there has to be other forms of measure. After a while, I believed I found a very convincing answer. "Evil" is when you care for nothing but yourself, and "good" is when you care for others and yourself. Therefore, demons are plain selfish to the bone.
So whether the demon is plain lazy and neglects others, or aggressive in maiming others for entertainment, they simply exhibit one same thing. They normally don't give a rat's ass whether