Obviously, you know next to nothing about John aside from what you have read in the few hastily written articles that have been published. John had built his entire life around getting to that island for 10 years. He first felt called to those islands in high school (he was 26/27) and had made most of his life choices around preparing to be on that island. His heart was to love and serve them and become one of them. He wasn't on a short term mission trip, he was moving there for the rest of his life or until they understood how much God loved them. Obviously, if you are materialist reductionist, this will seem the most absurd thing imaginable, but try to imagine that people can actually think differently than you. Within John's worldview, he was going to love and serve the North Sentinelese.
“You guys might think I’m crazy in all of this but I think it is worth it to declare Jesus to these people. Please do not be angry at them or at God if I get killed. Rather, please live your lives in obedience to whatever he has called you to and I’ll see you again when you pass through the veil. (Don’t recover my body). This is not a pointless thing—the eternal lives of this tribe is at hand and I can’t wait to see them around the throne of God worshipping in their own language as Revelation 7:9-10 states. I love you all and I pray none of you love anything in this world more than Jesus Christ.
Soli Dei Gloria,
John Chau,
November 11/16/18