You evaded the question, Beast. If you believe that the government is supressing all this information, there must be some reason. Besides, if half the planet is in on it (or actively denying, believing it is round while operating as if the world was flat. Ie: delaying shipping in the northern hemisphere, never deliberately flying over Antarctica as a short cut, conveniently ignore the giant, high altitude balloons posing as satellites), then you aren't really talking about a conspiracy as much as a big joke pulled on the other half of the world. The problem is, if there is never a big reveal, a joke is worthless.
Consider the costs associated with this. Not just money, money's unimportant in the long run.
This includes wars lost: the British not reinforcing and supplying their troops during the American Revolution, critical supplies lost during the trans-Atlantic WWII trade since they slowed down to keep the illusion of a round Earth, doubling the time they were at the mercy of the Wolfpacks. Reinforcements slowed down in the WWII Pacific theater; all travel times are consistent with round Earth distances both to Midway and to the Phillipines, so the US had to have slowed down reinforcements to the Battle of Midway, risking the entire war to keep up a joke.
This conspiracy has passed ludricous to the realm of sheer STUPIDITY.