Claiming that vulnerability is a moral virtue makes the mistake of putting vulnerability on the wrong side of the ledger. An existential term, it is made to pose as an ethical concept. Jonathan Lear helps us see why this is the case.
For in Radical Hope Lear advances the metaphysical thesis that human beings are finite erotic creatures. We are creatures of finitude in the sense that we are limited in a whole range of cognitive, affective, and volitional capacities: there are unsurpassable limits to our knowledge, to our emotional states, and to our wills. We can only know so much, feel so much, and do so much and no more, and there is no getting ultimately beyond this (call it) existential state of being human.