Progressives used to be believe, as should be obvious, in progress. Things are getting better and better, and once we solve the problems that are hanging on from the past, we will have a glorious future.
Even progressives at their most radical and violent thought this way. Marxists were convinced that while history is a bleak tale of class struggle and the revolution will be bloody and ruthless, eventually the state will wither away and communism will create the workers’ paradise.
Such utopianism sounds naive today. Not even progressives believe it.