Wonder of Darkness

I come from a line of belief where I have been raised to see the good in people--to know that we all have the light of Christ in our lives, if not all the time, at least on occasion. But we are all born with the light which I believe contributes to the feeling of warmth that comes from holding a newborn child (an opportunity I have been blessed to share in a handful of times).
However, with the mention of Charles Manson in the news and how he is getting married, the conversations that I have been having with my supervisor brought up the point that serial killers tend to have a following. A great deal of people will see their "work" as what it is--twisted, disgusting, degrading, a perversion of our God given agency to harm those around them rather than help them. But they have followings nonetheless that have a high and unhealthy admiration and devotion that makes my skin crawl. Not to say I haven't done my fair share of late night Wikipedia perusing--there is a morbid fascination that causes me to ask "what lead them to this?" "Were there signs?" "Could this have been prevented?"
Furthermore, aside from the serial killers of history, I have pondered a time or two about Hitler and how his reign of terror developed into the mass genocide of the Jews and other people that he didn't see "fit" to live on this earth. How did he and all others like him manage to become the people they became? I mean, yes, agency and environment just to name a few contributing factors have a great deal to do with it but how did they make it here? To Earth? To inhabit bodies of flesh and bone to be tried and tested the way Heavenly Father's plan dictated?
Now, I am not a theologian by any means, but growing up going to church weekly has instilled at least a basic understanding and knowledge of the war in Heaven where the two plans were revealed (our Father's plan that included agency and Lucifer's which would force all back to Heaven) and the "voting" thereof that ultimately lead to Lucifer renamed Satan to be cast out of Heaven followed by his ardent supporters and followers. One third of the host of Heaven. The spirits that never will have the opportunity to receive bodies in the likeness of our heavenly parents are forever doomed to serve Satan and lost to us, their once brothers and sisters who chose to follow Christ in the acceptance of our Heavenly Father's plan to come to Earth to be tried and tested.
Our first trial passed, we were then sent to Earth. All of us alike in the fact that we chose the right. But would it stand to reason that our levels of how much we believed in our choice vary from spirit to spirit? We all chose to follow Christ but how many of us were fully committed and joyous in the prospect and how many just chose the path because they knew it would get them here? Were there any who were torn at the choice? Who followed the majority (the two thirds) because they feared being thrown down from Heaven?
It makes me wonder. It makes me burn with the curiosity of my knowledge from my pre-Earth life. Did I personally know those who would be murderers when they came here? Did I know any of them as well as I would like to think I knew those who I consider family here on Earth?

It makes me wonder....