As there is no global government or other power, we can observe the relationships between people that have no common power and prove his assertion false.
Or we can observe that though someone may travel abroad, at home they are subject to a power (their home country's laws) and abroad they are subject to a power (the laws of the country they're visiting).
And then we can observe that your analogy really works best with the countries themselves, and of course the history of international relations is full of countries respecting each others' territory, sovereignty, etc. without any need for some third party to exercise power and hold them in check. Right?
Or we can observe that though someone may travel abroad, at home they are subject to a power (their home country's laws) and abroad they are subject to a power (the laws of the country they're visiting).
And then we can observe that your analogy really works best with the countries themselves, and of course the history of international relations is full of countries respecting each others' territory, sovereignty, etc. without any need for some third party to exercise power and hold them in check. Right?
Right?