I don't think the idea that NASA is lying is very far-fetced. It wouldn't be the first time the US government seriously lied about something big. However, in order to keep the globe theory up, every government in the world has to keep this secret. Isn't this a little unlikely?

There have been a lot of astronauts to space, from 18 different countries. On the ground, some of these countries can only fight, argue and make life worse for each other. Especially during the cold war...

Isn't it unlikely that, with all these different countries that dislike eachother that all went to space, they all agree to keep a secret by the US government?

Or maybe the other way around. Since the Soviet Union was first in space, maybe they came up with the lie. What would America gain by keeping this secret? It would be way more beneficial for them to expose the Soviet government and turn their people against them...

Some countries that would love to mess each other up: Soviet Union - USA
India - Pakistan
Europe - Soviet Union
Japan - China
China - USA
Etc etc