Response to Avery's "What is Harm?"
It's very interesting to investigate what is harm, and some of our semantic confusion over what constitutes harm may come from the epistemological difficulties relating to differentiating between objects and subjects. There is certainly direct harm, something negative happening to a subject, such as a punch in the face of a human. Also we can agree there is indirect harm caused by decreasing the instrumental value of an object, such as when damage is cause to a Monet or a child's teddy bear is trampled. With these definitions of harm it doesn't seem we can really 'harm' a non-subject.
There do seem to be some interesting hold outs. First, it seems reasonable to take Kant to heart; while we now avoid kicking dogs as we are aware of their intelligence, we might want to avoid getting in the habit of kicking computers so we don't get into the habit of kicking humans (or dogs) as well. Second, unlike computers, which exist because we bade them into existence for our service, plants have an existence separate from humans. Though I firmly believe that moral rights arise from the capacity to value, I intuitively feel that if one cuts down a tree not valued by sentient life there is still harm done to that tree and the other non-sentient organisms dependent on it. This may be a baseless intuition, perhaps a bootless inquisition.