I think you might be painting with too broad a brush. CTers do have trouble applying formal logic to situations, but that doesn't mean they are all necessarily ignorant or uneducated. It is more a matter of the educated ones know enough to not talk about their kooky or bigoted theories in front of strangers.
Look at the Obama/Kenya thing. Yes, great numbers subscribe to that theory only because it advances their political agendas, but there are a lot of educated folks that truly believe President Obama was born outside of the U.S. in such a way as to prevent his eligibility to run for president.
They killed Jesus.
More seriously: many countries and regions passed laws that prevent Jews from owning land, so they went into trades like tailoring, jewelry, pawn brokering. When a drought would come everyone whose income was tied to the land would suffer, but the Jews did not suffer economic hardship in the same way; therefore in the minds of the villagers, the Jews caused the drought. Also, the Jews were able to survive droughts a little more easily because they had to keep some money set aside for a rainy day (and by rainy day I mean being prepared to run out of town while the locals brandished pitchforks and torches), so the Jews were seen as wealthy. Also, the Catholic Church realized that if everyone bought into the Jesus story, the folks would be easier to control. By refusing to bow down to the RCC, the Jews were seen as thumbing their noses at God.
Add the facts that they ate different foods, wore different clothes, spoke a different language, celebrated different holidays, worshiped God on a different day of the week, etc. etc. and the recipe for hate and fear was complete.
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Sadly, you are very correct.