I don't care if your definition of "liberal" and "democract" are the folk that show up in Europe, we're not talking about those libs and dems, we're talking about the people that call themselves Liberals and Democrats in America, who happen to form the political Left. Even if you take into account the alleged policy changes the Democratic party made in the 40s to make them "black friendly", that doesn't change the fact that their seat of power and voting base was built where the largest native massacre, the "genocide" you refer to occurred and that they did the worst acts of the entire union in order to secure that land to build the unshakable political machine they have running today, and that hardly anybody knows about that.
Do you even give half a damn about the natives, or do you just want to see the stripes go down because you think they look ugly and are using them as an excuse to push it through? You could use lots of excuses to remove the stripes. 'They induce seizures while in motion." "Red is the color of blood which is what comes out when you shoot something, and guns are bad." "Color-blind Americans are unable to enjoy the redness of the flag so it should be removed so what we see is what they see." You could make any number of retarded reasons and push it through if you have the money to pay Congress, or not because as I've said there's a massive logistics hurdle and you'd get lawsuits up the ass by companies using some variation of the flag in their marketing.