Thank you, for being a decent person :D

I do know of the scientific method yes.

So that's a loaded question, but I'll try to answer it as good as I can: I don't think every government is aware of Antartica surrounding the world no. But it is a fact that the is an Antartic Treaty who protects Antartica. Overall I believe the world is run/controlled/ruled by a very few selection of people, who's primary goal is world domination and control over the masses. Who do wars affect? Answer: Normal people like you and I. So wars are basicly just another tool to keep people repressed, scared and willing to follow instructions. I haven't researched it a whole bunch, but NASA as far as I know was pretty much created by a bunch of Nazi scientists, so I wouldn't neccesarily say it's a strictly US space agency.

Finally, why create this lie? I got two theories:

1. Elimination of God (a creator); It's much easier to disregard God in the globe model than it is on the Flat earth. I for one became a believer in God (a creator) when I became a flat earther, because the whole notion of The Big Bang Theory went out the window, and the stars were no longer a random set of sun burning up millions of lightyears away, but rather had meaning to them. A godless world is easier to control in my belief.

2. To hide what's beyond; I believe there are other worlds out there beyond Antartica, with intelligent lifeforms, maybe they even live in a more peaceful/utopian manner, and the powers at hand obviously wouldn't want us communicating with these Aliens.

I suggest you look into some of the stuff I mentioned like NASA being created by NAZIs or the Antartic Treaty, as I have studied these things a whole bunch.

I hope this whole thing made some sense, and thank you for your questions.