A long article from derek halpern says it better than I have, here’s an excerpt:
Here’s The Big Reason Why People Don’t Change Their Minds When Confronted With New Data
It’s proven that when we’re confronted with information that supports our beliefs, we’re more likely accept that information. And when we’re confronted with information that opposes our beliefs, we’re more likely to ignore – or attempt to disprove – it.
In one case we’re dealing with confirmation bias, and the other we’re dealing with disconfirmation bias. And in the case of this gluten research, what we’re seeing is known as “attitude polarization.”
Back in 1979, researchers carried out an interesting experiment. They got together two groups of people: one group that supported capital punishment, and another group that opposed it. The researchers then provided these people information that either support or opposed their opinions. What happened? People didn’t change their mind. They instead tended to hold their original belief more strongly.
That’s attitude polarization, and it’s why I always say, “You can’t convince people of anything. You can only hope you provide enough information so that they convince themselves.”
clik the long article
Adhering to previous beliefs:
“Gee, good to see you! Wow, you’ve gotten taller and now you’re wearing glasses. But you don’t look a day older!”
“Sorry, you’ve mistaken me for somebody else.”
“No, no, Fred, I’d know you anywhere.”
“I’m not Fred; I’m Joseph.”
“Oh, so you’ve changed your name,too!”