FTR
The earliest documented mention of the spherical Earth concept dates from around the 5th century BC, when it was mentioned by ancient Greek philosophers.[1][2] It remained a matter of speculation until the 3rd century BC, when Hellenistic astronomy established the spherical shape of the Earth as a physical fact and calculated the Earth's circumference. The paradigm was gradually adopted throughout the Old World during Late Antiquity and the Middle Ages.[3][4][5][6] A practical demonstration of Earth's sphericity was achieved by Ferdinand Magellan and Juan Sebastián Elcano's circumnavigation (1519–1522).[7]
Do the minority of people who
still believe the Earth is flat have the right to be given equal credibility/platform when presenting their arguments? Some of them think they're scientists and could provide what they would call evidence. Should there be a chapter in text books explaining that there are other people that believe it's flat, so kids it's up to you which side you're on?
What about Evolution? There are many (God botherers) who still don't believe in it... Same applies, but they do get in some text books. Does that legitimise it?
It's about consensus between scientists on how good the science is, not how many of the plebs/priests/politicians agree, or not, and that's arrived at by others scrutinising The Science. Not just accepting the conclusions and saying "Oh well, you're a scientist, so we must take it seriously, despite you being in a tiny minority and perhaps funded by someone who has a vested interest in you coming up with your conclusions, oh and your methodology was shit."
Just because there are two sides to an argument doesn't automatically legitimise both sides.