Swarms of agents will have even stronger Goodhart's law than swarms of humans.

Agents are told to optimize one thing, and by god they will do it.

Humans will think, "well I have a reputation to uphold" or "this game is an iterated one, so I should balance short-term and long-term."

Individual humans feel bad when they fall into a Goodhart's law attractor state.

But agents don't, if they are doing what they were told to do.

Agents don't feel shame, or can very easily be made to not feel it.

It's quite a bit harder for (non-sociopath) humans.