Advantages of having a small population are less traffic, less pollution, more easy to get jobs, enough food and water supply and peaceful surrounding
"What Are The Advantages And Disadvantages Of Small Population?"
A smaller population means less pressure on infrastructure. Fewer houses, roads, bridges and buildings would need to be maintained, so the local government can spend more money on other, less urgent, aspects.
An advantage is that in a crisis there a less people to have to worry about
A smaller population helps in saving the earth. It also helps in decreasing c02 and smaller gasses..