Perhaps if we looked at this with a little understanding of human psychology we could make some sense of it.
Children with a high startle reflex and are fearful tend to grow up conservative. They have a larger portion of the brain that deals with fear and a smaller portion that moderates emotional reactions.
Republican politicians know themselves and use what pushes their buttons to get their folk to the poles. There is nothing to fear but fear itself but the symptom of fear is rage. So by making a conservative feel fear you also make him feel rage and just by doing this you can make him fear rage itself. So to freak out a conservative you simply have to suggest that somebody you want him to hate is angry. Lacking any scientific knowledge of how the mind works, science is evil to them, and lacking any internal intuition or self reflection, it's very easy to manipulate conservative voters.
Black folk, naturally have their own fears, but ones that are objective and real. Conservatives constantly use them to scare themselves. And naturally, of course, there are a lot of black people who, because they are used as tools, get angry about it, just as any other person used as a butt would.
This feature of conservatives is of course disgusting, but is a product of their own capacity for disgust caused by their innate fearfulness. They were dealt lemons by nature but they use them to make lemonade. They aren't stupid.