But I'm just wondering why the government would feel the need to hide this.
This question gets asked all the time on this forum.
The answer can depend on your current worldview, I believe in God so my answer will reflect this.
There is a group of elite satanists who are shaping society in preparation for a NWO.
They are wealthy beyond belief and control most of the worlds media and pop culture.
They set us against each other and start wars because it makes them lots of money,
They control our democracy and get their orders from the devil himself, they have been at it for centuries.
The global lie regarding the shape of the earth is there to remove the idea of God and inteligent design.
A person does not need to know the whole story to be complicite in their plans (agendas)
Even with all this power, they are not always successful, they just work steadily towards their goals.
Thats a rough Christian view of the situation, some would disagree.
Whatever you believe about the world will inform the way you view the conspiracy.