Board Thread:Speculation House/@comment-4830106-20131108040231/@comment-10390252-20140212081724

This is an interesting theory but it doesn't explain why the Grimm are so violently inimicable to humans, at least according to legend. There are two explanations that I can think of:

1) For whatever reason, the Grimm are inimicable to the psychic emissions of higher intelligence;

2) They're like an ecological antibody and reacted to humans when they started to transform their environment (with agriculture and building) by trying to wipe out the 'infection'. This could also connect to my earlier theory that humans are not native to Remnant at all but are an Earth colony that, due to the long-running crisis with the Grimm, have lost their true history during the struggle to survive.