I.Q. deficiency. There are some people who are an order of fries short of a Happy Meal, and what is often a characteristic about every one of these people is that they don't know it. They have no idea how incompetent or stupid they are. It's the exact opposite. They have the loftiest, highest self-image.
There are many lessons people can learn about the left. One of the key lessons is they never give anything up. Once they begin a quest, they don't stop until they've got it. The other thing that you need to learn is, they're never happy even after they succeed. They are never happy because there can never be enough to satisfy them.