Neither of those are functional parts of the Democratic Party, and neither seek to misinform and propagandize as the Right-wing media typically do.
Bannon is an expert manipulator. He knows how to make people react a given way, and harness that reaction to achieve a given end. That's his main skill.
He's not the only demon on Trump's shoulder. But he's one of the main ones. I think he sees Trump more as a tool to achieve his own ends than a leader.
The cause, ultimately, is that there are millions of Americans to whom that sounds like a plan. It's not. It's just demogougery.
And it's not going to help. You lot feel the same anxiety when you win or lose. It just feeds your appetite to be further accommodated.