Our world is full of stupid people and while one might think that a vast majority of them life in the United States of America that is simply not true... we have more than our fair share, but a majority do not live here... unfortunately they live in other countries... Americans, we can safely attest to are mostly smart... that is to say that most of our stupid people actually think they are relatively smart in comparison to those they hang around... which makes our situation actually worse than it really is.
Teenagers by far are the most stupid of the lot but all we have to do is look at their parental influences to understand why that is. And, it is not their parent's fault that they are stupid especially since a large majority of them graduated from US High Schools. US High Schools are ranked around 15th in the world making those graduates with straight "A's" were probably only earning straight "C's" instead... there is nothing more crazy than someone who is stupid thinking they are smart and then attempt to raise a child with that false level of intelligence.
My father used to say that this person could not pour piss out of a boot with directions written on the heel... and, while that is an ugly way to describe a fellow human being, it is undoubtedly the truth... and, during my lifetime, I have had the pleasure of working around all sorts of smart people who also wore boots. Yes, the logic has been presented to be questioned... not just accepted as the gospel truth... However, that same father once told me that the best part of me ran down his leg... and, I spent the rest of my life wondering if it was the physical part of me or the mental part of me.
Our television commercials are based on stupid people watching them. Our street signs have been specifically design with stupid people in mind, especially the SLOW MEN WORKING signs posted all over the highway when construction on our roads is in progress. They must be getting paid by the hour and not the job because there are never any FAST MEN WORKING signs.