Well, that's the truth, really. For instance, there's ample evidence that Hitler might have escaped to Argentina aboard a submarine after losing the WW2, while the school textbooks and the mainstream historians still claim that the bones found near the bunker belong to Hitler, which is dubious at best.

Nevertheless, the Allies and the Soviets won the WW2 and thus we are led to believe that Hitler died at that bunker. What else could they have done? The manpower sacrifice by the Soviets to subdue the Nazis was so great that they needed a trophy to bring back home, which would cement their victory. How are they supposed to do that with an empty grave? Furthermore, it is widely theorized that the former German chancellor Angela Merkel is a daughter of Adolf Hitler, born after Hitler had escaped to Argentina.

This is just one example of history being written by the victors, where the Nazi party died in that bunker along with Hitler. The historians can try to sieve the objective truth out of the veils of history, but even their attempts are somewhat limited by the confines of the mainstream beliefs.

For example, why hasn't there been a more thorough investigation of the Pyramid of Giza and the passages within? Because of the mainstream belief that it's a tomb, not an ancient power plant. Beliefs play an important role in what could be unveiled from the annals of history.