It is one thing to hold a view that, upon analysis, turns out to be mistaken. To err is but human. However, one should become extra careful when the view one expresses, is an allegation. It becomes even more serious when it is the worst allegation one can possibly make, viz. the accusation of responsibility for the Holocaust. The situation with allegations is simple: either you prove them, or you yourself are guilty of slander. This then can be held against Pollock: he has made a grave allegation, yet has failed to buttress it with proof, though not for lack of trying.