Who bears the responsibility for John Chau's death?

I’m sure you’ve heard the story. Chau was going to bring Jesus to a remote Indian island, the North Sentinel island, inhabited only by indigenous people, who had made it clear in the past that they wanted to be left alone. They were known for violently repelling outsiders.
Chau knew this, but he went anyway even though it is illegal.
A “friend” hired 7 fishermen for $325 to ferry him to the island. The natives fired a warning shot the first day, hitting a book he was carrying, so he swam back to the boat. Then he went back again the next day and they didn’t shoot at the book any more. They shot him and now he’s dead.

Now the 7 fishermen who sailed him there are in jail, but, apparently, not the friend who paid them.
Some people want to find the natives who are “responsible” and punish them.
Do the parents bear any responsibility for raising such an arrogant, rude, insensitive person? (The parents “forgive” the Indians who shot him by the way.)

What are your thoughts on this?