Are the arrows bidirectional?
The directionality of a link, represented by an arrow, represents the direction in which you should read the claims for maximal effectiveness. The arrows direct the eye. A philosophically trained reader might think that the arrows would point in the opposite direction, from the disputing or supporting claim to the disputed or supported claim, given that that is the direction of dispute or support in everyday language. But such organization is backwards from a readability standpoint; it’s not the direction that real arguments or conversations take. We understand arguments in a chronological order, from earlier claim to later counterclaim. As such, claims are disputed by and are supported by other claims.
