I think a lot of religion that faces with good vs. evil misses a key point. Who decides good and who decides evil? Most will say God or similar power, and may point to things like the ten commandments. However, Good vs Evil is a subjectively projected by a person, group, or society, with the latter usually creating the basis of measurement. Again, everything in the universe is a circle, and one can not exist without the other.

As the statement about a movement has to have a devil, I wouldn't call it a devil but more of an opposing sociological force. It is human communication and emotion that makes it evil, but it really isn't.