Why did the Holocaust happen

There are a lot of theories out there but when I went to a holocaust museum this is what I was told. Hitler used the already strained economic times in Germany to blame the Jewish people for the economic state of Germany, and the lack of employment opportunities for Germans. By the time Hitler came to full power, there was great hatred for the Jews. Because the Nazi's did to publicize what they were doing to the Jews many Germans thought they were being deported not murdered.