Between folks on the right and those on the left.
Predators want to kill you and eat you right there on the veldt. Parasites, by contrast, want to keep you alive, the better to serve as a parasite paradise, a cozy haven where they can grow at their own pace, suckle on your moist, nourishing tissues, multiply their numbers and finally, one way or another, pass those numbers along.
At the end of the quote, he then adds
Kinda like the difference between, say, terrorists and lobbyists.
And that is the difference between the folks on the right, who worry most about the predators. While folks on the left are more worried about parasites.
Very simple, when you come right down to it.