In part, that's because Stupidity comes in such a variety of flavors that it puts Baskin-Robbins to shame.
I have a saying I like to use: “We are all “A$$holes”.
My theory goes as such: Many of us try to drive a car in a civilized, polite and heads-up manner. We largely succeed, but even the most astute and careful drivers amongst us eventually do SOMETHING that will piss off someone else. We drive appropriately 99% of the time, but...that one time you misjudge the speed of an oncoming car as you pull out, or begin to change lanes and don’t see that car in your blind spot. The person in the other car thinks you are a total jerk, even though you drive well 99% of the time. Then you multiply that by EVERYONE driving on the road who has that 1% lapse, and everyone ends up driving around thinking everyone else is an inconsiderate bastige!
But this is different, I suppose...I can screw up that one time, but I can drive well the rest of the time. Kind of like that old saw: “I will wake up sober tomorrow, but you will still be ugly and stupid...”
Stupid is forever!