This is just basic psychology. It takes a long time to change someone's political beliefs, and it isn't effective to just argue with people, even with facts. Interestingly, one way to get people to change their opinion is to frame things in terms of how it affects them and their family.
It took me...I'd say 2 years from being a full conservative to a left-leaning independent. And then another 2 years to being a moderate to progressive liberal.
It does happen. But some people are so rooted in their political identity that they will never change.
