What stopped people from bullying me when I was a kid? When I hit one them in the face and he didn't show up for school for two days. Teachers were baffled and didn't believe it even when most of my class, including me and the bullies, told it to be so. Good old 90s...

"...that some of Aiden's classroom friends told him that they didn't want to hit the boy but did so because they were afraid not to."

Crazy...

"kindergardeners" from the title made me picture a bunch of little kids gardening. :)

On topic, though, if we lived in a more primitive society, this would be a pretty good way for teachers to control bullying. Although, considering the bully is a 6-year-old, the parents are likely to blame for the kid's behavior and should be the ones getting beat down instead of the kid or the teacher.

What's all this Bully Backlash lately? They're an essential tool in teaching wimpy brats Survival of the Fittest.

... Kids, and people in general todays are too thin skinned, and whimpy for that.

Plato claimed that two signs of a degenerate society were A) people seeing doctors en masse instead of leading healthy lifestyles and B) seeking arbiters / lawyers to settle disagreements instead of handling them personally. While the short formula of "if there are plenty of doctors and lawyers, you are dealing with a sick society" is something most people would likely discredit, I think the reasoning behind this is legitimate.

(insert commonly known trivia about Eichmann and Milgram & Stanford prison experiments here)

That's a DESCRIPTIVE theory, not a normative one -_-. There's a difference between "laws of nature" (like gravity) and "natural rights" (like the right to live).
EDIT: good thing in English "law" and "right" are separate words...