John Sides and Eric McGhee for Politico:

But the notion that so many of our political ills stem from gerrymandering is, in fact, a bad idea that simply will not die—what we call a Zombie Myth. And when it comes to Zombie Myths in American politics, gerrymandering remains one of the most persistent. Actual evidence from political science research shows only weak correlations between gerrymandering and both polarization and electoral competitiveness. So why does the Zombie Myth persist? We think three major misconceptions are to blame.