There are a lot of things we can't proof for ourselves, and we could be wrong about.
But the flat earth theory has some great issues. Yea, media and politics are lying about almost everything, but why should they spend millions and millions on fooling us about the Form of the earth? For some thousands years almost all advanced societies believed in the round earth.
And today we. Use it! A lot of things (like iridium communication satalites) could not work with a flat earth. And even if you do not believe on satralite communication, this satalites ate even visible to naked eye and you can calculate where they are based on a round earth.
But after all, what does that have to do with a financial c