Trustworthiness demands both shared interests and competence to serve them. [definitional]
Dylan is wrong, of course, about how surely one can trust oneself. Trustworthiness not only requires that one share the interests of the other as directly or indirectly one's own but also requires the competence to serve those interests.
DEFINE: Breaks down the concept of trustworthiness into two necessary components: aligned interests and actual competence.
Russell Hardin, Trust and Trustworthiness, loc. 188