Simonism451 said:
Natural selection and random transcription errors in DNA produce outliers in every gene pool. Nature creates jerkwads at a consistent rate to maximize the potential for survival. These jerkwads often have a lower survival and procreation rate, so natural selection keeps the population balanced while lowering the probability of extinction, just in case having a jerkwad or two around increases the overall survival rate.
I apologize for this giant wall of text, but it does explain some things and leads into my own controversial opinion.
While the jist of your post leans toward correct there are a few misconceptions I thought I would point out. Not meaning to be an ass or anything but its a peeve of mine to point out misconceptions about scientific theories to educate especially when it comes to natural selection and evolution. You likely already know these things already, but I will state them anyway.
First off natural selection doesn't care about anything and the theory itself says nothing about balance nor about lowering a probability of extinction. It describes a phenomenon that the individuals within a population that pass on the most genes will have a greater impact on future generations. Over successive generations this can cause many different things to happen, but the most commonly described of which is a shift in the average trait that proves successful until it reaches an optimum. Species may also diverge if two ends of the spectrum prove optimal but an intermediate is not and ect...
Once the average is centered on that optimal point variation in that trait will continue due a variety of factors such as genetic drift and mutation. New situations may change the optimal trait such as food availability, predation, and so forth and the changes continue until a new optimum is reached. Mutations may also occur producing a new trait, or more likely a new function to an existing one and selection continues.
To sum it up, natural selection does not create variation within a population, nor does it state anything about balance or lowering odds for extinction. Random errors do create variation along with genetic drift, epigenetics, and other things. Natural selection drives it to an optimal point. Evolution is the change of a population over time which is a combination of factors including but not limited to natural selection and genetic drift.
While genetics is certainly a tribute that be attached to things like intelligence it really holds less effect that people may think on forming a persons opinions and views of the world. Those are things imprinted on us in the same manner speech is. It would be like saying someone born and raised in Russia will speak Russian based on genetics. It just doesn't work that way.
This brings me to my own opinion, that the large variation in human intelligence is from nurture not nature. With the exceptions of people with intelligence disorders such as downs syndrome there really is no reason to believe that such a wide variation in human intelligence should exist. Humans do not vary much genetically due to an suspected bottleneck effect we experienced near the beginning of our kind. This is evident by the fact that you are more closely related to anyone on this planet than some chimpanzees within the same or neighboring families are. Thus I have no reason to suspect that the stereotypical valley girl could not have become a stereotypical professor or doctor if given the right environment to do so. This also means that their children have the potential to, and thus the idea that assholes should not be allowed to procreate is unfair to the child. Assholes shouldn't be allowed to raise children, but then we open a whole can of worms that simply can't be sorted in a democratic society that contains so much variability in culture, values, ect.
This leaves us with two options. The first involves educational reform to help increase the converts from the seemingly less intelligent and those misinformed. The second is to have as many of our own children as possible and raise them to our standards and have them do the same.