Who's to Blame in Protocols

In class we were watching a documentary on the Protocols of Zion and the conspiracies that come along with it. It was said that the Protocols of Zion were the Jewish people's plans to take over the world, but in reality that seems absurd. However, we still have people that buy into that and people tend to question why? How is it possible to believe that out of the hundreds or thousands of Jews that worked in the World Trade Center,  none died. As many people were interviewed, it showed a lot of people bought into this theory and I believe it is because they want an answer. Since there is no one we can truly blame it has to fall on someones shoulders and unfortunately that ended up being the Jews. Al-qaeda took credit for this crash, but we have no proof over who did it. So when we have no answers in the future for a tragedy, who will be the next group of people blamed?