You're adding in additional concepts that change the arguement. The original post talks about fences and guarding resources, not about someone taking a cut of other people's work.

Additionally, even in the self-governance principles mentioned above there is a need for:

5. Graduated sanctions: Appropriators who violate operational rules are likely to be assessed graduated sanctions (depending on the seriousness and context of the offense) by other appropriators, by officials accountable to these appropriators, or by both.

You could argue that "sanctions" and "weapons/violence" are separate things, but ultimately even the economists mentioned above call out there is a need for enforcement on how "commons" are used.

Edit: quotes are from https://en.wikipedia.org/wiki/Elinor_Ostrom