From the Skepticality Podcast, 1st episode, Derek said the following and I particularly liked it.
“Put false info in, teach it as truth, and it becomes true to a lot of people. Then when they hear the truth, they actually want you to prove the truth, because the false has become what is accepted.”
Take it for what it’s worth…I’m sure it can be applied to both sides of any arguement. But, it’s still a very true observation.