I know this, yet it's so easy to forget.
"So what happened in people’s brains when they saw information that contradicted their worldview in a charged political environment? As soon as they recognized the video clips as being in conflict with their worldview, the parts of the brain that handle reason and logic went dormant. And the parts of the brain that handle hostile attacks — the fight-or-flight response — lit up."
http://time.com/110643/how-to-win-every-argument/
"So what happened in people’s brains when they saw information that contradicted their worldview in a charged political environment? As soon as they recognized the video clips as being in conflict with their worldview, the parts of the brain that handle reason and logic went dormant. And the parts of the brain that handle hostile attacks — the fight-or-flight response — lit up."
http://time.com/110643/how-to-win-every-argument/