Mark Roseman, in his well-researched and subtly argued book, takes an intermediate position. He gives full weight to impersonal bureaucratic factors, and also to the time-factor by which brutalisation was gradually stepped up, but he also shows that, in the last resort, the motive force behind the atrocities was belief. For example, he shows that the individuals who attended the conference at Wannsee, where the Holocaust was planned, were mostly youngish enthusiasts for Nazi "ideals", and that the few older participants who retained some of the earlier civil service ethos did try, however ineffectively, to counsel moderation.