Could they have invented their stories to bring the Germans in a bad light? If so, for what reason would they do so? There are a lot of questions raised in this quest for the truth whether in favor of the Germans or the Jews but what matters is not who a researcher is inclined to support but that, the aim of every researcher should be to dig out and expose nothing but the truth.
In the interview of David Cole with Dr. Franciszek Piper (youtube.com), the interviewer cleared himself to be a Jew who claims to be an atheist but still respects and has nothing against his being a Jew. His cultural background may acquire him the benefit of the doubt for being fair in his inclinations about the subject matter however there are other matters that would still need to be considered. For instance, could there be a possibility that the concentration camps and gas chambers been altered to support the claims of the modern Germans? No one may be able to prove what really happened but thinking things over, what could be stronger evidence against the testimonies of prisoners who survived the Holocaust?