You know, I didn't understand the story of the frog and the scorpion when I read it in my teens. But now, as an adult, having known many more people and life-situations, I can understand how some people just can't help being evil, even against their best interest, which is I guess why people often settle for the adjective "stupid" when referring to them, but I guess it goes deeper than that.

I guess the way I express it goes against the point of your article, but actually I don't identity any group of people as scorpions, only individuals, and only after they've displayed scorpion-characteristics, so I hope there's no patternicity there.