It's a word that has been at best deliberately overloaded, and at worst hijacked. Who would want to stand in the way of "progress"? It could equally well mean, the more you earn they more you get to keep.
No, it is a description of the tax code. It is not a judgement of the tax code. It is a 'progressive tax' or 'progressive tax rate'. It has nothing to do with 'progress' or the 'Progressive party'.
