Not only political correctness, but the fascination with erecting cultural walls.

Very true, and it has been around significantly longer as well. It's rooting in puritanism, and is pretty strict about moral decency. I suppose you could say the Left version is as well, but with a different idea of what moral means.

The difference, and the reason I think people are in a panic about the more recent left version, is the difference in enforcement. It feels like we're starting watching the Left take their turn at McCarthyism, but largely using technology instead of government.