Mankind has never stopped progressing. If that's not sustainable, I don't know what is.
You're confusing progressivism with progress. The two bear nothing in common except some letters.
Progressives want the US to "progress" to the condition of the USSR circa 1964, minus the strong military.
That's not progress, kid. That's the exact opposite.
Progressive is derived from progress.
As far as " Progressives want the US to "progress" to the condition of the USSR circa 1964, minus the strong military ", I've never read anything even remotely like that here except in this post.
So, I think that you are debating with yourself on this one. I wonder who will win?
In the meantime I will always admire progress and work towards achieving it.