Now about the second point... humans can create devices which are more truthful than they are. What if one day we were able to create artificial intelligence to rival man, and this machine came to the conclusion that humans are a threat to the universe and should be wiped out? Is it then justifiable for the computer to systematically destroy the human race? And going back to the first point, if these computers were able to convince the majority of humans of the validity of their proofs, then doesn't this make it out to be true?
Let's put Artificial Intelligence in perspective: As computer scientists we are still struggling with the very simple problems that we have tried to solve since the 60's. We have been successful with some tasks that are solvable by brute force, like chess, but still struggle with apparently simple things like understanding written or spoken language, recognizing objects in images and the like. The day when a machine is more intelligent than a human is so far off that we can only leave the the subject to Science Fiction.
As for your question of why did I come to this site, I am very interested in the severe problem that scientists have to make people understand the principles of science. Why do intelligent people like you have trouble understanding the difference between evidence, proof and truth? Why do people think scientists are looking back, trying to hide errors of the past? Or trying to prove what has already been decided is "true"?
True science is written when an apparent absurdity is backed by solid evidence. For example, Einstein told us that a single object could at the same time weigh less than a grain of sand and more than a car, depending on the observer. But solid evidence backs Einstein.
Seeing the way Flat Earthers think is interesting, since it they go about exactly in the opposite direction. They start from the truth as they see it, which is not absurd for somebody with no knowledge of physics, astronomy, mathematics or history, and work towards explaining what they already decided to be true. And this is happening in several areas, not just the shape of Earth.