A wise man once said that there is nothing more common than wasted potential, in that sense I agree with some of this article.
It does not spell that out right at the beginning, or even necessarily at all. But it is not discussing all possible uses of the word "stupid". "Wasted potential" definitely doesn't work for discussions about active harm being done (at some points).
(As such, another common critique I see is trying to decide if it's "right" or "wrong", but that's the wrong question. As it proposes a definition, one that I think undeniably does have the ability to be applied to the world, the question is rather if it is useful. I have found it so, but that's debatable. But that's at least the correct debate.)
I assume anyone who has had any experience with the world at all has "cause[d] losses to another person or to a group of persons while himself deriving no gain." Are there any non-stupid people?