Because it didn’t. Put all his aside of what the Jews have told you. This is a one sided argument nowadays unless you’re actively trying to disprove it. To start, like the other guy said, there were wooden doors on the camps. Second, an executioner from America with a degree from Boston University Fred Leucther, and two other chemist wrote a manifesto about why the Holocaust couldn’t have happened. It describes things like wooden doors, an improper ventilation system, and a fake chimney, all of this would have led to the camps all being poisoned if it were used enough to kill 6,000,000 people. Third, there were only 15 cremation ovens in Aushwitz to burn the amount of bodies the Jews said were burned would have taken over 20 years. Also, they tattood the number of people on the Jews