I'm going to have request a source here, because this doesn't make much sense. We've spent very nearly all of our evolutionary time pillaging, raping, and murde

I'm going to have request a source here, because this doesn't make much sense. We've spent very nearly all of our evolutionary time pillaging, raping, and murdering each other - not exactly singing kumbaya. There's tribal instinctual stuff that would include 'in-group' trust, but that's something far and away from trusting a person because they're a person as you're implying. 'Fake news' takes advantage of something much more simple. People believe what they want to believe. In other words the people led on by fake news tend to already want to believe what the news is about. When we see something that confirms our biases, many of us don't question it. And this is made even worse since people tend to work as apologists for fake news from sources they like, so instead of being able to discuss the issue of fake news - it ends up dividing people into splits on the 'fake' topic at hand, which in contemporary times is most often political.