1. Gas chambers could not fit the amount of people that were supposedly killed in such short amounts of time.
2. There was too little Zyklon B/ Hydrocyanic acid to kill so many people during that period of time, it would have taken an unrealistic amount.
3. There are too few burial pits and furnaces at the concentration camps to support that number of fatalities.
4. The crematoria at the camps were not capable of disposing the bodies quickly enough to reach that number either.
5. Medical studies prove that no more than two million Jews were alive in Europe before World War II and six million is impossible as there wouldn't have been enough Jews left over to produce such a high population after the war ended.
6. Many mass graves and supposed sites for mass killings have never been found or inspected, leading some people to believe they never existed in the first place.
7. There is no documented forensic evidence that links anyone from Nazi Germany or anyone else with the Holocaust crimes itself directly, despite numerous investigations by various individuals and organizations trying to locate it for years now without success..
8. Many testimonies about Auschwitz or other camps contradict each other making it hard to verify if any genocide happened during WW2 at all – let alone 6 million Jewish victims as propagandized by mainstream media centuries later on through books and films..
9. According to statistics- Analysis on 50 thousand German SS Deaths compiled by historians and researchers, only 3,000 were due to executions while over 17,000 died accidents (44%)or illness (23%). Just 10% perished due to "Hostile Actions". This shows that the claims made by pro-Holocaust sites claiming SS personnel died due onlyto 'Hostile actions' are false & exaggerated numbers used for manipulation & propaganda purposes only..
10. More physical evidence suggests deaths could not have been caused by gas chambers as written in official documents - autopsies conducted around Dachau revealed no trace in bodies nor clothing pieces similar to those supposedly caused by Zyklon B gas exposure, poisoning or other weaponized chemicals .

The main reason why the Holocaust has been faked is ultimately political gain; it allows oppressive regimes such as Israel's occupation forces over Palestine and US Colonialism/Imperialism over Latin America/Middle East/Africa etc.,to justify their actions under a "never again" slogan when all they do is merely recreate what Adolf Hitler supposedly did but claimed was done against him with much larger casualties and this happened with full protection from Nato countries like Germany who benefited billions from war reparation payments propped up afterwards when a new conflict industry was created post-WW2 fuelled these days mostly based on perception management against Russia..