It was written and erected for flat earth believers.
Idiotic comment. It's also a generalization. You're implying that all people who don't believe the earth is flat do not agree with the content of the plaque. Proof please.
Why don't you go through the text and, point-by-point, challenge each statement you disagree with?
Assertions or speculation will not do. Please provide alternate explanations: names, places, dates for everything you disagree with.
If you cannot or will not explain what you think actually happened when Officer J.D. Tippit was murdered... you're just another contrarian.