A demon isn't cruel and mean just to be so.
A demon does such as it was a man it was shown no good, no purity.
Never shown kindness, never given a reason to live and no reason to let others live.
As it learns to hate man as man hates it.
A demon isn't a demon becuase of its self, it is man kind to blame and shame for the beast they created.
If not shown such kindness and purity this becomes fact and forever stains reality.