I don't know how much sympathy there is here, but N's are sick people too...that is why they have a help group for people who suffer from that disorder. Perhaps their disorder may even be traceable to a malfunction in the brain that one day medication may help. Believe it or not, some N's can feel remorse and pain at their own inability to stop their behaviour. Do you talk about a depressed person and call him a vampire, etc. and tell him or her to just pull out of it, that they are really just seeking sympathy, and are bastards for behaving the way they do? I don't think so.
Do you want N's to say sorry? Even more to the point, to feel sorry?
It is the tragedy of the N condition that it has repercussions into other people's lives that makes it difficult if not imposssible to get sympathy, but it is precisely the N's inabiltiy to recognise that the he or she is causing those repercussions (empathy challenged) that makes this such a hateful condition. It all seems normal to them...till they start reading blogs.
Michah suggested,among other things, that there is a caregiver support group.