Reasons

Uh, righto, this is just a short one-shot. I know it's tame, and thar be no sexings, but I'm posting it here because... well, just because.
I don't love Itachi, but I don't hate him. I feel a lot of pity for the poor guy, imagine what he must have gone through to make him do what he did? I think that of all the characters in the narutoverse, he is the most interesting. And that's why I wrote this, it's just my version of why he might be who he is, though it's obviously a pale shade of what really must have gone on.
If you wish to critise, go ahead, I could always use critique.


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I had become what I never should have been. I had become a tool. I was forced to kill the defenseless again and again, for all were defenseless against an invisible hunter. I did all for those who are not me; I did it out of love at first. Desperation to shine in their eyes shone in mine. I was called a genius and loved by all those I sought approval from. And I thought that this was surely the purest of pleasures, but the higher I got, the harder to breathe.
It was such a slow thing I barely noticed it, but the creeping shadows began to haunt me. I saw the faces of those I had loved begin to turn to masks that hid what they truly were. They tore at my soul, telling me I was a genius. But who is a genius at taking life? I ended so many lives, and each time I was praised for it. The blood that stained my hands was what they took their glory from. I was invisible for the all the light that reflected on me at that great height. I wanted to shine, but not like this.
I withdrew into myself, lest my own darkness taint them, the last few innocents that remained around me. I removed myself from those that glorified me too, hoping that in doing so the shadows would be banished. I had no such luck though, the shadows still whispered in my ear, their voices the screams and sighs of those I had felled. I felt my sanity begin to slip and my hands were not strong enough to hold it. However much it slipped though, I would keep killing, that was what I was built for. I stalked both night and day, hiding my face so none would seek me out.
I continued like this for an eternity it seemed, building a wall between me and everything I could think of that might need such protection. I gripped my sanity again and found solace in the fact that what I did was for the betterment of others. I pushed on with my life, and I think I could have continued like that for the rest of my life. Then I saw the one last pure soul that I had tried so hard to protect being instructed in how to kill. I had always known it would happen, and before I was given the role of lashing out from the shadows I had even trained him myself. But now I knew that I could not allow such a life to taint him. And so I attempted put a stop to it the only way I possibly could.
First I took that final step to becoming a monster, slaughtering the one person I had yet to shut out. The pain that tore my soul at that moment is something I will never forget. After that it was a simple matter to protect that last soul. At the end of my task, my clothes turned an obscene red, I did the most selfish thing I could have done. I let go of my sanity and told that last soul that only he could kill me.
I let him become what he should never have become.