Political correctness is one of the engines of nannyism. Allowing and even encouraging offensive ideas is vital for the intellectually health of a free society.
Modern Democrats aren't the first political party to abuse power - far from it. Obama isn't the first president to abuse executive power - not by a longshot. But he has to be the first president in American history to overtly and consistently argue that he's empowered to legislate if Congress doesn't pass the laws he favors. It's an argument that's been mainstreamed by partisans and cheered on by those in media desperate to find a morsel of triumph in this presidency.