Because it killed about 6.4 million Jews.It was tarable to that that many people died because people got mad then the Nazi party and then the group got bigger and bigger so then they made camps then took the Jews to the cams the acted like they were going to take a shower but it was really a gas trick and then they took the bodies to the crematorium then the burned then till there was no more of them left and they used the babies as target practice. But when they got you they put you on a train or they shoot you.