The World Government is different
While Hirate does fight against the world, he did not overtax his people. He did not exploit them that much.
In the beginning, yes, he exploited the people. But that is also because he was forced by the circumstances.
After the World Government gain great stride in technology and stability, most of the government policy settles the people of the World Government.
Soldiers are paid generously, scientific innovation is encouraged, the wellbeing and the cultivation of talent is paramount.
Hirate himself sent a lot of army to clear any dangerous zones and settle any people who wanted to settle in this zone.
The policy that Hirate had done, the kind of administration he had employed make many people in the territory of the World Government lives a prosperous life. The law is clear, the people are safe and the prosperous age dawn.