Research it. Every time the guards told the truth, they were tortured, threatened with hanging, and/or had their families threatened. Most quickly learned to figure out what testimony was desired of them. Some of the camp personnel went to the noose insisting that they did everything humanly possible to prevent the disasters in the camps, but had no supplies with which to do anything, despite repeated requests for same.
As for the testimony of the prisoners, they were indeed in camps. Their mere survival, however (in astronomical numbers, no less), suggests that either the Germans were the most inefficient people on earth, or that there was no operation to eliminate the Jews.
Research it? How have you identified credible sources, by selecting those who are anti-jewish and rejecting those sources who have corroborated what is generally accepted? Who were your sources telling you that camp personnel who "told the truth" were tortured?
Would you deny that Nazi Germany embarked on a eugenics program? How would that eugenics program conflict with the contents of
Mein Kampf? Wouldn't there be a ton of consistency between what Hitler wrote in
Mein Kampf and recorded history viv a vis the Jews and the eugenics programs?
I can certainly understand noting a lot of Jewish presence in the marxist and other leftist movements (and let's make note of, and consider the fact that Nazism is in fact another leftist movement)...that's pretty undeniable, but it also ignores the participation of many other peoples---all of whom are endowed with Free Will.
Let's not overlook Eisenhower's warning to us in his last public address. He warned against the military-industrial complex. Now, were he a part of the so-called jewish conspiracy of which arguably the MIC undeniably is a part, would that not have been a self defeating move? Things just don't mesh here.
