Dismissive Replies to "Why Should I Be Moral?"

[...] if asked what it means to be guided by moral duties (does it mean usually doing our duty? always doing it?) Al is unlikely to have a sharp answer. [...] it exposes not only the error just mentioned - the error of regarding M as obviously a reason for Al to be moral - but a more general and important error: the error of treating as axiomatic, as in need of no evidence, the view that moral considerations supply every agent with practical reasons.