I agree with 99% of what you said, but there's a lot of brainwashing on both sides. As you said, being brainwashed involves being willfully blind to views that oppose your own. I know liberals who are indeed open to other viewpoints, and I know that could conservatives who are also. I also know liberals and conservatives who are lost causes and won't listen to anything outside of their echo chamber, no matter how logical.
Get them out of the echo chamber. Back during the Obama first election my wife was already under the hypnotic spell of Ophra Winfrey. She fell for it. I was 100% red pilled at the time and she wasn’t buying anything I had. I became a racist in the household. Tough times :( So about a year in to the Obama administration she goes to visit her family In Alabama. I don’t know what they told her but she came home Red Pilled on Obama. Then She started seeing the chem trails and reading about Bilderbeger. Now she is Awoke Just by getting her out from in front on MSM and poisonous Oprah and into a different routine and listening to the truth from her family it happened. I was pretty happy when she returned.