I'm having issues. I need some enlightment. Like, now. LOL

Why would someone guide someone else into the worst side of humankind? 
Why would that first person want to kill the second person's naïvety?
How can it be justified - better yet, CAN it?
Would the second one allow the first one to take away his lack of experience, his innocence?
And why?

I need to find out the answers to these questions. I need clarification so that I can write about it. I have had this idea 2 years from now, it urged me to write a fiction on this subject and I know not how to start, even though I do not intend it to be any essay - not to be handed a Nobel, LOL. I'm not that good.
As a matter of fact, I write poorly, I believe. That's why I'm reading a book called 'How fiction works' xD

 

Anyway, if anyone could help me, I'd value it very much and I would give cookies to the blessed ones who cared enough to give me a hand ; )

LOL