To summarize: GOP politicians, like almost all people, act in their perceived self interest. Self preservation is the strongest instinct driving human behavior.
Republicans have been trying to hold the line by top-down politics which are now simply being overwhelmed by the bottom up cultural/demographic revolution done to us by the left. After Trump, the deluge.
The lesson: we've got to change the very same institutions, just as progressives stole those institutions, and get our culture back. Politics is downstream from culture and liberty is downstream from politics.