That infants have no such ability was the whole point of the example. Children do have such responsibilities when they have the ability.
have is actually a transitive word, not ditransitive. An example of the latter is give: A gives B to C. I disagree that there's metaphor here, commutativity is a very technical term and it relates to operations such as addition. So in fact I do think it's relevant that have is stative, because this implies it's not an operation. When speaking of ethical matters it is simply more common to use words like symmetry and reciprocity.
I'm sure I can make the case that bears are the indirect object of my having responsibility -- or rather are not -- but if you prefer, I withdraw the metaphor. The point is that it goes both ways :)
Ah I see now why you would call it ditransitivite. I believe that you would call it an argument/complement to 'responsibility', as 'have' is not an inherently ditransitive verb.
The point about whether it goes both ways is a matter of opinion I think. I feel that humans have an obligation to treat animals well, not necessarily because of how they would feel or their obligations to us, but because it makes humans look bad not to. Kind of like how a gentleman is supposed to be polite regardless of the situation.
have is actually a transitive word, not ditransitive. An example of the latter is give: A gives B to C. I disagree that there's metaphor here, commutativity is a very technical term and it relates to operations such as addition. So in fact I do think it's relevant that have is stative, because this implies it's not an operation. When speaking of ethical matters it is simply more common to use words like symmetry and reciprocity.