Why do people believe obvious lies?

I spent maybe two hours tonight (two hours I’ll never get back) answering a whole lot of people who believe heinous, outright lies about the Jewish State of Israel.
I found this article that might help explain why people are so gullible:

Author: El

Progressive Zionist, Father of three sons, Grandfather of four boys, four girls, and Great grandfather for one granddaughter. Jewish, Druid, Pagan, Hin-Jew, Hin-Dru, Bu-Jew, Bu-Dru, Pantheist, Democratic Socialist, Life Long Democrat, Writer, Purveyor of unconventional wisdom.