You can’t talk to them. I have tried. They are in the religious cult known as liberalism, and like any cult they first need to realize everything they have invested in is a lie. Some day they may have a change of heart, and then you can explain.
This is essential in understanding the situation. Liberals cannot be convinced; they must be converted, experiencing metanoia, meaning a complete change of thinking--the word which in the Bible is translated "repentance," but repenting doesn't mean saying you're sorry, but admitting your whole thinking and acting was wrong and you need to start from the beginning to get it right (again).
For those of us who were hardcore liberals in our youth (I was an all-in volunteer for McGovern in 1972 when I was 18, and all the union people were for Humphrey), we understand this. I loved America, I loved the idea of America, but I had to go through a complete conversion in order to understand what the "idea" of America actually was, and it took over a decade (much like David Horowitz, though I wouldn't put myself at his level) to come to the admission that my love for America required conservative thinking.
To make it worse, I went from liberal to neo-con, believing that globalism would bring the best of America to the rest of the world, rather than bring the worst of the rest of the world to America. But leaving neo-conism didn't take a conversion, since it was evident that it was accomplishing the opposite of what it promised, so my thinking didn't change, but rather the method--and that is what happens in convincing.
To convince someone, you and s/he have to share the same set of first principles, and that is no longer the case with liberalism; it might have been in the 1940s with Truman or the 60s with JFK, but no longer, and I am sad to admit that I am part of the reason, helping to turn the Democrats in the McGovern direction.