"It’s not just the Trump tribe that has moved to the extremes. So has the Democratic tribe, where the Bernie Sanders wing now makes up the loudest voices in the party. Their strident brand of identity politics is doomed to fail in the heartland, where people care more about the economy than social justice. And they can be as conspiracy-prone as the nutbars on the other side. In their view, Mr. Trump and his cabal of evil schemers are virtually on the payroll of the Russians. They’re convinced that Mr. Trump must be impeached, the sooner the better."

This viewpoint is as dangerous as the alt-right. There is no equivalency between Bernie Sanders and Donald Trump. There is not a left extreme as there is a right. The republicans are untethered from reality in a way the democrats simply aren't. You can't solve the problem by normalizing extremism and saying some people think the earth is flat and some people think it's round, who knows?