As you say. Dunce and fool. The fool is slightly more intelligent and thus arrogant, and despises the dunce. The dunce, not so bright, hates the fool for that arrogant treatment and wants nothing more than revenge — burn down the house, no matter the consequences. If the fool will suffer in the process, it’s enough. And yes, I’m afraid that these two groups (btw. I would estimate them to be 30–40% of the Earth’s population) would most probably have to annihilate themselves in an act of mutual destruction before the rest of us can move on.