They aren ' t mind wiped , as if they were they wouldnt have the distinct cultures that define each chapter . But they are brainwashed and indoctrinated to be absolutely loyal and zealous to the Emperor and the High Lords , as well as to be resistant against fear , pain , depression etc . What happens when a marine breaks that conditioning ? Usually , they fall to Chaos . <| sep |> we ' re at the mercy of the younger generation who will probably look at us like we ' re total fools . Their solution will probably be to drag us out into the forest and let the wolves take care of usThis is why we take care of the younger generation and vote in their interests as well as our own , unlike certain generations tend to . <| sep |> Make them cold more like directly threaten their lives when they ' re out in freezing temperatures miles from their homes and most sources of heat .