That's... That's not an opinion. First of all, if we take the entire American populous that is not vegan, and the entire American populous that is, who do you think has more people? Obviously, the ones that are not vegan. While there are idiots in both groups, the animal product consuming population will likely have more. Both sides may have geniuses, but the animal product consumers will be more watered down because of the amount of stupidity in the pool of people. It is way more likely the average I.Q will be higher in the vegan group solely because of this.