You are guilty of brandishing the "But Republicans" paint brush broadly. Nevermind a Republican was the figure head of the Civil Rights movement (Martin Luther King Jr) while it was opposed mainly by southern Democrats (Orval Faubus of Arkansas, Lester Maddox of Georgia, and, especially George Wallace of Alabama). There are many Liberal Republicans and many Conservative Democrats.
I think what is needed here is to stop labling people by party. Most of the "socialists" in occupy and other movements proudly admit to their socialism (Libertarian Socialism to be exact), and most progressives do likewise. Modern Liberals follow progressive policies defined as growing the government to create a society where social justice is the norm. This means there would be no rich, no poor, and the goverment would regulate that status quo. Social justice dictates that the rich must pay for the poor because the poor are unable to pay for themselves.
The Conservative argument is that in America, these programs promote a wellfare state in which we make the poor complacent with "free stuff" (paid for by the rich) and they give their governors more power in exchange. That this system does not encourage people to become self sufficient and successful.
I would further posit that progressivism is slavery in disguise, bringing me back to Martin Luther King Jr who had a dream of all americans being equal to "open the doors of opportunity to all of God's children." The point being they would be provided opportunity, not handed wellfare checks and told to sit down and shut up, the Government is here to take care of you.
Have a nice day.