Looking for the name of island culture that killed people who boasted to be leaders of men

This might all be bullshit, but I’m looking for the name of an island group/tribe that was known for killing those who boast to be leaders of men and profess to want to be an elder or chief…basically with the whole moral or message being transmitted is that those who think they should lead men and control them are the ones who are most dangerous and least able to rule.

Any ideas or thoughts on this or the origin of it?

I haven’t heard of this island but think it is a great idea for America!

Australia: