User blog comment:Martialmaniac/Why the Hunters Association?/@comment-10528819-20151205110311/@comment-14902757-20151206233931

(Paragraph 1) Something like that.

But in the world of Hxh, I think the question should be more like "why only HA?"... Imagine if the HA Chairman is a self-absorbed leader, he could practically take over the entire world and rule over it because of the power he has at his disposal. In the show, other than nuclear power which is unlikely to be used against nen users, there's nothing stronger above HA that would control them. The only thing that keeps them from overtaking the entire world is the good will of the chairman and the rules he set.