Ok, so there's spirits that have problems with dead bodies or undead conditions. These are the vampires, zombies and spooks on the loose. Granted they have personal problems that make them outsiders to most highly controlled humanoid societies.

Spiritual outsiders need help with their condition and problems. However, they are not basically evil and out to destroy mankind as Hollywood propaganda may imply.

The bad guys of the universe have been trying to create superior human beings. The Nazis tried this with their "master race" experiments and aliens have manipulated human DNA to produce their own hybrids. This tampering with the human body probably goes back thousands of years when the "gods" were seen as half human and half animal. Hypnosis and brainwashing have been part of these experiments. Religious sects have found themselves being used for population control. What a person believed in and who he/she was suppose to obey was laid firmly into weak minds.

A suicide bomber is one example of this religious mind control in action. I believe, these bad guys are alien scumbags who abduct humans and brainwash them for their own diabolical purposes. You can call them "Grays", "Marcabs", "Demons", "Evil Spirits", etc. It all amounts to the same thing: Behavior modification by erasing the existing personality and replacing it with something that is more amenable.

As one of the good guys, I'm not in the group making humans or spirits weaker and more controllable. I want beings to remember who they are and where they came from. I want empowered souls so they can defeat those who place others under subconscious controls within the dark recesses of their minds. 

http://en.wikipedia.org/wiki/Villain  (Bad Guys In Fiction)

http://userwww.sfsu.edu/~jordonez/ (Other Influences)