In human social affairs, there's an occasional random change in social institutions, where somebody accidentally sets fire to his hut, and his pet pig burns up, and it's discovered that the burnt pig tastes great. Then everybody burns his hut down to get roast pig. There's an old Chinese story to that effect. After awhile, some genius realizes you don't need a whole hut every time, but can just roast pigs over fires. The original burning was a random change, analogous to a DNA change. But switching to a fire especially made to roast pigs is a planned change, and once tried, it behaves just like a random change. If it works, it spreads till everybody is doing it. The "if it works" part is the essence of both Darwinism and rational conservatism.
But sometimes wannabe geniuses get an idea for a change, and instead of testing it on a few individuals or groups to see if it works, they establish the new practice by decree or force, because being geniuses, their ideas don't have to be tested. And that is the essence of no evolution that ever took place, and of liberalism, where intentions are all that count. Changes are made for ideological reasons, not for practical reasons, and are an end in themselves, not needing testing.
But here it gets tricky. Once some new ideological notion is put into effect, like Affirmative Action, and it doesn't work at all, the geniuses get to work lying and fudging statistics to prove that in spite of all appearances, it does work, or would work if we were stricter about it and poured more money into it or silenced the opposition to it more thoroughly.
So to modify the saying to fit the liberal Zeitgeist:
"If it ain't broke, break it, then spend billions trying to fix it by breaking it further.'
And that covers about all "progressive" ideas for the last century or so.
Jerry Pournelle, at his Chaos Manor site, shows how one progressive idea, "Whole Language" has followed that pattern:
(This is part of a longer post you can read HERE.)
Quibcag: Sorry, I don't know who the girl is.