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He and his family have likely been threatened.

[Blurb2350]

He and his family have likely been threatened.
If so, those threats are much more likely to've come from the Holocaust enforcers than from the deniers. Public espousal of Holocaust denial (or "historical revisionism" as they seem to prefer) comes at a very high cost. That's why you usually only ever see borderline nut cases singing that particular song out loud. Most keep it to themselves.