I agree with Nekron on this one Wasted
Shadow People,Dark Shadows or Shadow ghosts are not devils, demons or aliens, as some people with too much imagination and too little knowledge would have you believe.
Shadow people are shadowy, silhouettes of human forms seen mostly at night, and are the most common form of ghost apparition people see.(wikipedia)
Oddly enough they most often seem to flee when confronted with an actual Human.
Its also been reported in diferent instances that some Shadow people seem to pass right through walls and other obsticles,while others seem to have to go around them.
Shadow is indication of spiritual condition, and is the absence of light or truth. In other words, shadow people are disembodied humans who are lost, having not gone forward in life?s journey .By refusing to go forward and not being able to go back they find themselves in this position after the death of the physical body.
Back to the question I have to say that there is light and dark,good and bad in all of us.
I believe it is the individual that controls both.
I dont believe that there is a part of anyone that just has to be dark.(besides what is dark to one person may be Perfectly fine to another)
Just my 2 cnts