I agree that doing it in Austria is different from doing it in England, because presumably some group of Austrians must have invited him to speak.
But see my post above. I don't think we disagree about Irving, we just disagree on what the most prudent way of dealing with it is.
How Austrians deal with hate crimes (a dubious category but perhaps sometimes justified) is their business. But since Irving evidently hasn't spread his lies there for 16 years, this prosecution doesn't strike me as an imminent necessity to prevent the spread of Naziism.
Perhaps what you are saying is that it is not good to make him a martyr in the eyes of his followers, much less to resurrect him long after he'd been discredited.