Does the source of the message matter or the message itself? How can one argue with:
"The left is responsible for (Trump winning) because the left have now decided that any other opinion, any other way of looking at the world is unacceptable … So if you’re on the right, you’re a freak, evil, racist, stupid … a basket of deplorables. How do you think people are going to vote if you talk to them like that?”"

As it says, why would you vote for someone who treats you like that? That polarization is real, both in the US and here. It serves no good purpose and the vast majority are held hostage by the ideologues at either end of the spectrum.