Regressivisim is a disordered way of political thinking that has gone global. There's plenty of historical evidence of political thinking that is downright terrible and has been shown to be so. Many people supported these systems at the times too. It never made them right.
It's also much less in the US. ~65% of people don't support regressive policies. Who turns out to vote, the electoral college, lack of actual proportional allocation of the House of Representatives, and many other things present problems where regressivism can succeed despite the large majority of people not wanting it.