And you have missed an obvious issue here.
Most rigorous academics have trouble finding funding if they don't expect to come up with something new and exciting. The circumstances of this trial created an unusual situation. I can't comment on the book since I have not read it, but I am willing to accept your representation that it is solidly researched. What of it? Demonstrating that one historian believes in objective truth (if that is what the book did) hardly changes the fact that most historical analysis will attract attention only to the extent that it produces findings that are new or different from what came before. People are unlikely to keep buying new books or funding massive research projects explaining the radical new premise that the Holocaust actually happened. Why would they? We already know it happened.
Furthermore, it is clear from even a casual reading of analysis of history, both modern and not, that some of the material is written precisely because it will stir up debate ... and that some of the various claims cannot all be true. How much of that garbage is written by professional historians is unclear to me, but it gets written and people seem to buy into some of the nonsense.
I'm afraid that even if one or two historians do believe in objective truth they are working in a culture that is not terribly receptive to the notion of objective truth. They will inevitably end up feeling like salmon trying to reach their spawning grounds.
There was here at Speakeasy a bit of a rhubarb over the practice of modern historical research and an assertion by some that recent Historical inquiry has been tainted by relativism, and disagreement with previous interpretations simply for the sake of newness.
There was a conflict which arose beginning in 1993, and which resulted in a libel trial in England which was critical in sorting this situation out. Deborah Lipstadt, in her book Denying the Holocaust: The Growing Assault on Truth and Memory (1993) took issue with statements by prolific and prominent amateur historian David Irving who took umbrage at being called a Holocaust denier, and filed suit for libel. Richard J. Evans, a prominent Cambridge historian of the Third Reich was called in to be an expert defense witness for Lipstadt, and to evaluate every document Irving used, looking for distortions, bias and selective quotation.
Evans own book on the subject is called Lying about Hitler: History, Holocaust and the David Irving Trial.
"When Deborah Lipstadt's Denying the Holocaust: The Growing Assault on Truth and Memory (1993), a groundbreaking book about the disturbing movement to refute the reality of the Holocaust, was published, one of the writers identified as a Holocaust denier, the Englishman David Irving, sued Lipstadt and her publisher, Penguin, for libel. Although Irving never earned a degree, he has written nearly 30 books about Hitler and other related subjects. His contention, therefore, was that Lipstadt had denigrated his work as a historian by accusing him of distorting the historical record to support his extreme anti-Semitic politics. The defense had to prove that Irving, in fact, had deliberately misrepresented the contents of relevant documents to conform to his sympathetic view of Hitler and his belief that nothing on the order of genocide occurred under Nazi rule. (Richard J.) Evans, a Cambridge-based historian who specializes in modern German history, was retained by the defense as an expert witness, and he chronicles his arduous research effort with impressive lucidity. At question was the very bedrock of history: Is there such a thing as historical objectivity? Or, as Evans writes, "How do we know when a historian is telling the truth? . . . Wasn't it all a matter of interpretation?" Sensitive to these conundrums and the high emotional valence attached to the Holocaust, Evans was scrupulous in his examination of thousands of pages of documents, assiduously evaluating Irving's interpretation of such primary sources as Goebbels' diaries, always on the lookout for evidence of inaccuracies and bias. He found plenty, and he describes his discoveries with quiet and contagious excitement. By sharing his vast insider's knowledge and recounting his surreal experiences on the stand as Irving, who represented himself, conducted his chaotic cross-examinations, Evans enables readers to fully appreciate the significance of both Lipstadt's victory and Irving's exposure as exactly what he claimed not to be. There is such a thing as truth, and history, responsibly practiced, will reveal it." review for Booklist by Donna Seaman.
It's a stunningly well done piece of careful unbiased research and a fitting reply to those skeptical of academic rigour and honesty. I heartily recommend it and Deborah Lipstadt's book as well.
Rob

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic