But then the algorithms have to maximize value from all the data that’s coming in. So they test use that data. And it just turns out as a matter of course, that the same data that is a positive, constructive process for the people who generated it — Black Lives Matter, or the Arab Spring — can be used to irritate other groups. And unfortunately there’s this asymmetry in human emotions where the negative emotions of fear and hatred and paranoia and resentment come up faster, more cheaply, and they’re harder to dispel than the positive emotions. So what happens is, every time there’s some positive motion in these networks, the negative reaction is actually more powerful. So when you have a Black Lives Matter, the result of that is the empowerment of the worst racists and neo-Nazis in a way that hasn’t been seen in generations.