Imagine a situation in which an empire has no emperor for many years. The regional government officials throughout the country have their own military forces, and occupy their positions for countless years.
Each one of those government officials will eventually come to view the area they control as their own kingdom, and themselves as kings!
That was the situation in the Mountain and Sea Realm, with the Lords of the Nine Mountains and Seas being nine kings!
The future Lord of the Mountain and Sea Realm was the Emperor!
None of those various kings would want to be ordered around after such a long time. After having a taste of freedom, they would balk at the thought of someone above them telling them what to do, nor would they accept the fate of being perpetually manipulated by another!
When such circumstances arose in an empire, then... the simplest and most effective way to deal with the situation, and also the method that would benefit most of the parties involved... would be to kill the Emperor before he had a chance to return to power!
That would be the best solution for all of those kings!
Meng Hao knew that, and because he understood it... he could tell how much danger he was in, and knew that he had to...