Political parties change over time.
Back in the 1840’s it was the Democrats that supported slavery, and in the years after the Civil War it was the Democrats that ran the south bringing about the Jim Crow laws, encouraged the KKK, and in any way possible keeping black folk down. This you can’t deny as the history is pretty clear. This era only ended in that 1980’s when the last of the old line southern dems in the Senate became gone. It was a Democrat of Robert Byrd who was the last former proud member of the KKK in the US Senate.
It was the Republicans under Lincoln that freed the slaves, and under T Roosevelt in the 1890’s that broke up the trusts. Additionally all of the civil rights legislation, and other social legislation, of the 1960’s would not have passed without Republican support. In fact the civil rights legislation had a higher percentage of Republican votes than Democrat.
So to say that only libs, democrats and progressives are the ones on the side of improving the cause of those down is bullshit, and historically not accurate.
Furthermore from the point of view of those whose incomes have dropped a significant percentage in the past 10-12 years, or who in that great mass of people no longer working but want to, plus a whole other series of issues it seems to them the Dems, libs and progressives of the world are concerned with everything else except them.