Madeline: Science denial really grinds my metaphorical gears, and Flat Earthers are some of the most egregious about it. So manhandle them into strait jackets and shove them in the damn rocket already.
On the contrary, we need alternate opinions to sharpen our own arguments. Banning them leads to an echo chamber effect where nothing ever challenges our thinking.. which is a big part of the problems facing the world today.