He isn't a "trouble maker", all he has done is to raise a few awkward points that certain interested parties would rather weren't raised (it might affect their bank accounts).
He is in jail now for something he said, an opinion he expressed 17 YEARS ago. Though "Holocaust denial" is a crime in Austria, David Irving only questioned the existence of gas chambers at Auschwitz, which in the hysterical eyes of the media means that he totally denied that anyone, Jews or otherwise, were mistreated. Not quite the same thing really, is it?
Since you are being a little boffin, Sknight, read up on David Irving's work, not what other people say about him. If you have an enquiring mind, and don't swallow every single piece of information you are fed by the powers-that-be, you might just question some of the "truths" about the Second World War. Read the evidence, for and against, the gas chamber debate, not the anecdotes of alleged witnesses, then make your own mind up. If you were in court, which would you be most convinced by - witnesses or forensic evidence?
I've read a fair bit of this revisionist stuff, and I'm not totally convinced by it, but then again it has led me to question the "6 million Jews gassed" statement. The truth is somewhere in between, both sides make fucking ridiculous claims. Of course, even saying that you think the official line isn't quite 100% fact in Austria, would have you sharing a cell with Irving for the next 3 years. Ridiculous!!
Question what people tell you are FACTS, when other learned people tell you they are bullshit, and you will be OK in life. Just don't say it out loud that some figures don't add up, or that the physical evidence isn't borne out by the terrible stories, because that will make you a "trouble maker"