David Irving makes a point

In an interview from his cell, D.I., who denies the gassing - or the extent of it - of Jews by Nazis, said he's on his own because most historians are afraid of being sent to jail as he was. While this is probably a wild exageration, and most historians probably don't feel coerced into their theories, it is true, that evidence isn't usually accepted in a democratic court of law if it has been obtained by torture. In the same way, history shouldn't be based on legally acceptable facts and/or censorship.

BBC

The prosecutor also deemed the sentence too light because of "Irving's special importance to right-wing radicals", a spokesman for the office said.

This is a society admitting it is incapable of ridding itself of its extremist elements without blaming it on an indvidual. My grandmother fled Austria. Austria was probably the only country invaded by the Nazis where the latter were truly welcomed. Creating scapegoats isn't a serious way of coming to terms with the past.

"Given the ruthless efficiency of the Germans, if there was an extermination programme to kill all the Jews, how come so many survived?"

That in itself is stereotypical nonesense. Any thinking person can see that this man is not a serious historian. Only those who are not so sure need the law to decide for them...