>>715274192
Because all of them see humanity as a threat even the "friendly" ones who act as merchants.
>Rangdan were so dangerous that the dark angels and multiple other legions were sent to wipe them out and almost all records of the war were purged because it was the closest the imperium ever came to losing
>species that ages everything around them rapidly and the more of them that gather on a planet this effect increases
>they breed like rats and hide aboard human ships
>if enough of them gather they can wipe out all life and kill the planet itself through rapid time shift
>Megarachnids
>Kroot eat everything they kill to evolve and are as physically capable as a space marine
>Khrave are psyker slavers who can brainwash entire planets into being cattle
>eldar created a fucking chaos god
>orks made human cattle farms and it was such an offense that the iron warriors assisted loyalists to put a stop to it.
>the moment tau got a taste of the warp they begin mass killing of their human servants aboard the ships
>tyranids
But people will say the imperium are just as bad as everyone else.