Since moral responsibility seems to require free will, hard determinism implies that people are not morally responsible for their actions.
So what exactly does that imply about supposed moral knowledge and behaviour, etc.?
Does a lack of moral responsibility etc. infect other norms and values, so that e.g. there are no norms of etiquette or behaviour at all (no-one to blame), even epistemic norms (I couldn't have done any better) and aesthetic values (who cares)? I don't think it does, but then I have a hard time believing that free will is necessary for moral responsibility, that 'ought implies can' cannnot be contextualized to save the phenomena, especially if the phenomena is subjective.