I have come to believe their stupidity helps them lie and cheat and herd together and hence act together. This is because stupid people often beleive their own bullshit and don't know when they are wrong. I have noticed this in all kinds of people including bad small business owners who will enjoy initial success because they are unknowingly breaking all the rules and hence cheating but eventually fail when they get either caught or lose their money from stupidity. This also explains the cycle of the Jews success. They succeed until their stupidity leads them to excess and everyone has had enough and they get thrown out or stopped. If they had half a brain they would stop while they were ahead. Of course Shakespeare makes this point in the merchant of Venice where the Jew actually insists on his pound of flesh from a debtor. This so outrages everyone it causes resistance.