Blame the non voters. An overwhelming percentage of the 44% non voting population identifies as Dems or left leaning. I'm not talking about those who can't or have been legally purged and shit. I'm talking about the disenfranchised and those that just sit on their hands instead of trying.
I did a research paper in college about gerrymandering and low voter turnout. Two things were blatantly clear, if you remove gerrymandering for a neutral geographic district drawing, or everyone turn out to vote, the Republican party would never win the presidency, hold the senate, or the house again. They would have a smaller amount of governorships, mostly in southern states, and would hold less state legislative bodies.
I don't need to get into the reasons why so many don't vote. But if they did this infection called the GOP would be a small regional party at best. And mind you this was just after GHWB was elected, reaganmania had swept through the nation and gerrymandering was not nearly as bad as it is today, and the population has swung way more liberal since the late 80s early 90s.