> If an illegal immigrant kills a person while in the US, they get tried according to US law. If a diplomat kills a person in the US, they do not get tried because the US has no jurisdiction over that diplomat.

Diplomats have diplomatic immunity, which is not the same thing as jurisdiction. For example, diplomatic immunity doesn't extend to a diplomat's commercial activities: https://www.law.cornell.edu/wex/diplomatic_immunity. So if a diplomat sells you fake Hermes bags passing them off as the real thing, you can sue them in a U.S. court. And the U.S. court will have jurisdiction.

> Discussion of law discussion that uses comparison with international standards is quite common in every legal system... So yeah, sometimes discussions of law can be complicated. This one... Ain't.

We have to look to international standards concerning latin phrases to understand what Americans meant by the phrase "subject to the jurisdiction," but that isn't "complicated?" If you say so.