Unlike I'm assuming everyone who has a problem with this, I worked at a major publication, and have had hundreds of things published. There were articles my bosses absolutely disagreed with. More than one. But they published them.
I don't condone Bannon's demeanor or stances, and I don't read Brietbart, so I can't really speak to it. What I can say is that, if his publication worked like many others in this world, he doesn't necessarily condone or agree with what's written. I'm not saying he does or doesn't. I'm just saying that, from my personal experience, there are categorically things on IGN I wrote that were published even though the powers that be didn't agree with what was written, because that's how it works.