For what it's worth, cops in America in certain scenarios act the same way, faced with similar upside/downside risks.
Not really, we just got better at it. Combat in the Ancient Near East consisted of bludgeoning your opponent with maces, clubs, and other blunt instruments. It took awhile to kill someone. We seem to equate "violence" with the duration spent killing someone (as though "dragging it out" is worse), but the end result between the millennia is the same: person A kills person B. We can just do it now in seconds with a single well-placed bullet instead of multiple minutes of agonized bludgeoning.
I feel a straightforward example of exatcly this may be Moriori of Chatham Islands.
contact, even if benevolent, would probably kill them all via disease. that doesn't include potential social and cultural upheavals, etc.
you either keep everyone out, hard, or you lose everything.
> After several days, six Sentinelese—an elderly couple and four children—were taken to Port Blair. The colonial officer in charge of the operation wrote that the entire group "sickened rapidly, and the old man and his wife died, so the four children were sent back to their home with quantities of presents".
Oh you mean October 7th Hamas standards or the Israeli Gaza genocide standards, or maybe the US in Vietnam standards?