It's not surprising. There's research suggesting that believing in one conspiracy theory makes you more susceptible to believing in others.

The structure of conspiracy is that some shadowy cabal is doing [bad thing] and they're hiding it from the rest of us. The evil people in charge at NASA, the Vatican, and every institute of higher learning ever want to brainwash us into thinking the Earth is round. And big surprise, those evil people in charge are also Jews. Antisemitism fits into almost every Western conspiracy theory.