The Flat Earthers could have used Casey to go against YouTube for unfairly negatively categorizing their particular view of the universe.
As indeed they may yet. Certainly one’s notion of the shape of the earth is not constrained by law. Nor should it be so. We are yet free to advance our devoutly held ideas irrespective of state orthodoxy.
As to actions based upon our beliefs, if they are coherent with ordered liberty as described by law, let them be, for they are no hindrance upon the natural order of a self regulated society.