Keith M. Bellizzi, Professor of Human Development and Family Sciences, has an article on why it can be so difficult to change people’s minds by pointing out the facts. It’s worth reading the whole thing, but here are a few excerpts.

Your worldview, including beliefs and opinions, starts to form during childhood as you’re socialized within a particular cultural context. It gets reinforced over time by the social groups you keep, the media you consume, even how your brain functions. It influences how you think of yourself and how you interact with the world.

For many people, a challenge to their worldview feels like an attack on their personal identity and can cause them to harden their position. 

People tend to reject evidence that runs counter to their beliefs, which makes them feel threatened.

There’s another cognitive bias that can get in the way of changing your mind, called confirmation bias. It’s the natural tendency to seek out information or interpret things in a way that supports your existing beliefs. Interacting with like-minded people and media reinforces confirmation bias. The problem with confirmation bias is that it can lead to errors in judgment because it keeps you from looking at a situation objectively from multiple angles.

A 2016 Gallup poll provides a great example of this bias. In just one two-week period spanning the 2016 election, both Republicans and Democrats drastically changed their opinions about the state of the economy – in opposite directions.

But nothing was new with the economy. What had changed was that a new political leader from a different party had been elected. The election outcome changed survey respondents’ interpretation of how the economy was doing – a confirmation bias led Republicans to rate it much higher now that their guy would be in charge; Democrats the opposite.

What can you do to train yourself to keep an open mind?

Allow yourself to learn new things. Search out perspectives from multiple sides of an issue. Try to form, and modify, your opinions based on evidence that is accurate, objective and verified.

Don’t let yourself be swayed by outliers. For example, give more weight to the numerous doctors and public health officials who describe the preponderance of evidence that vaccines are safe and effective than what you give to one fringe doctor on a podcast who suggests the opposite.

Be wary of repetition, as repeated statements are often perceived as more truthful than new information, no matter how false the claim may be. Social media manipulators and politicians know this all too well.

And when you try to persuade others?

Presenting things in a nonconfrontational way allows people to evaluate new information without feeling attacked. Insulting others and suggesting someone is ignorant or misinformed, no matter how misguided their beliefs may be, will cause the people you are trying to influence to reject your argument. Instead, try asking questions that lead the person to question what they believe. While opinions may not ultimately change, the chance of success is greater.