Hitler and the holocaust

Right at this very moment i can't help think of the movie "The Boy in the Stripped Pajamas." We watched it in English, and its has one the most sadist endings ever. A young boy not know how bad it is for the Jewish people goes into the camp to help out his Jewish friend find his father. He gets sucked into a round up where their going to kill them by gases. He gets killed along with the Jews, i don't understand people. How can they be so scard of one man that they believe that Jewish people are bad and will try to take jobs, money, and homes from. How could anyone do that to a poor child or anyone. What have they done to deserve that treatment, NOTHING. The Holocaust shouldn't have happened and in a way we can blame our government for not stepping in. Yes i know they were trying to stay out of it, that was Germany's business but there have to be a limit to when we help and when we don't help Between 11 and 17 people died during the holocaust, 1.5 million of those were innocent children. Some barely old enough to know why they were in there. Most were Jewish children, little babies who couldn't defend themselves. We read a book called "Night" in this book one the Jews said that why used babies for target practice by throwing them in the air and shooting at them. Elie the main character said the say a grave site full of dead babies and children. I JUST DON'T UNDERSTAND!