Andrew Sullivan has an excellent post about how the Left has changed:
This is the media hub of the “social justice movement.” And the core point of that movement, its essential point, is that liberalism is no longer enough. Not just not enough, but itself a means to perpetuate “white supremacy,” designed to oppress, harm and terrorize minorities and women, and in dire need of dismantling. That’s a huge deal. And it explains a lot.
In the successor ideology, there is no escape, no refuge, from the ongoing nightmare of oppression and violence — and you are either fighting this and “on the right side of history,” or you are against it and abetting evil. There is no neutrality. No space for skepticism. No room for debate. No space even for staying silent. (Silence, remember, is violence — perhaps the most profoundly anti-liberal slogan ever invented.)