You may find it relevant (or not, I'm not sure) to refer to the examples of "pre-civilisation" human ancestors caring for those with what would amount to permanent physical disabilities. This may open discussions into what exactly is required for a social construction to be created an exist, in terms of "society"/civilisation.
I can't remember the specific names but there is definitely at least one well preserved skeleton that is referred to that had injuries from broken bones which would have prevented signifcant movement and certainly participation in hunting and so on. It also showed the signs of having lived many years after the injuries were occurred (and hence presumably being cared for) however.
Incidentally also a counter argument to the arguments employed by social darwinists regarding "primitivism" in "survival of the fittest", as it quite clearly demonstrates altruism has been a feature of humans and their ancestors for a loooong time (there are of course many other examples of altruism in non-human animals besides, but this is definitely off the topic if the previous comment was).