I genuinely think stupid, ignorant, mouthbreathing retards are the greatest threat to humanity as a whole.
It used to be that only the moderately intelligent would gather, discuss, and spread ideas. By oral tradition, by books, by newspaper, by radio, by television, and even on the internet. There was always some barrier to entry, some way to filter out the truly retarded.

But in our greed, we created the perfect devices for retards to congregate with other retards and spread their retarded ideas.