You're making the grant of affection, forbearance, mercy, out of your own experience and, of course, out of cultural tradition. You're saying, to use the well-worn analogy, if I love my children, that puts me under obligation to assume that other people love theirs.
It All Turns on Affection: The Jefferson Lecture and Other Essays (ed. Counterpoint, 2012) - ISBN: 9781619020979