de·mon (dē'mən) Pronunciation Key
n.
1. An evil supernatural being; a devil.
2. A persistently tormenting person, force, or passion: the demon of drug addiction.
3. One who is extremely zealous, skillful, or diligent: worked away like a demon; a real demon at math.
4. Variant of daimon.
According to this...i know some human demons!! The word demon is as subjective as evil. There is no evil to me, only ignorance.
There are no aliens..only one big family