In what follows I consider whether the idea of a person's interest or good might be better understood through that of care or concern for that person for her sake, rather than conversely, as is ordinarily assumed. Contrary to (informed) desire-satisfaction theories of interest, such an account can explain why not everything a person rationally desires is part of her good, since what a person sensibly wants is not necessarily what we (and she) would sensibly want, insofar as we care about her.
First, however, a tale:
There was no other explanation which seemed reasonable. … [W]as it not reasonable to assume that he meant never to claim his birth-right? If this were so, what right had he, William Cecil Clayton, to thwart the wishes, to balk the self-sacrifice of this strange man? If Tarzan of the Apes could do this thing to save Jane Porter from unhappiness, why should he, to whose care she was intrusting her whole future, do aught to jeopardize her interests?