Their borders, sure.
Savagery, nope.
It is also known why, and if you had bothered to consider the details of this article you might have gotten a clue. They moved his body only from a distance, dragging it into the see with a noose.
The primary reason they kill outsiders is that they see them as bringing death.
The reason for this perception is (of course) that for the Andaman Islanders outsiders generally are. They have been isolated for so long that their immune systems have never had to deal with diseases that no longer even
stress westerner's bodies enough to produce an unpleasant symptom. The diseases many of us carry can and will kill these people. And if they ignorantly attribute the cause to evil spirits rather than microbes they are still accurate about outsiders bringing death.
Your arrogance and ignorant disdain about whether these people live or die confirms what I said about you needing to house illegals Lurkin. You don't give a crap about the dangers they can bring.
Let's see if you can hold on to that when it hits you.