I agree that the concept of 'social justice' as some kind of separate sort of justice is a categorical error. My studies have taught me that there is only justice. It has implications for people as individuals and it has implications for the political process and the economy, but all of those implications follow in the same way from the same ethic of justice.

I do think Hayek's notion of knowledge is hogwash. Things like "institutions" and "tools" are certainly products of knowledge, they represent knowledge, but they are not knowledge itself. Both can be integral for people as far as effecting choices is concerned, and knowledge is also integral to that process, and effecting choices is what we humans do, but a distinction between products of knowledge and knowledge itself is still present. I would agree that institutions inform people's approach to effecting choices--as can tools and other material accoutrement--but that follows from knowledge of those things. They are still not in themselves knowledge per se--as i see it.