From vocabulary.com:

"Believe-- If you believe something, you think it’s true. If you are easily duped then you might believe your little sister when she says a thief broke into the house and ate all your candy.

Believe comes from old German words meaning to have trust. Belief doesn’t require proof, just acceptance. "

Apparently acceptance doesn't require reason. I understand what you're saying, though. These parrots have had their brains short-circuited to bypass reason.