I think our discussion is what it ultimately comes down to, and the way to temper the shock value is to emphasize the vast scope of the terms pleasure and pain. Our concerns for our fellow men and art and science and all that fall under pleasure and pain too. We take pleasure generally both in knowledge and in being kind and compassionate to others, and we generally take pain in the pain of others. It's simply a matter of being clear eyed that these traits are not universally the same, and if anyone is going to prevent violation of these "norms of feeling" it has to be us humans and not supernatural gods or universal forms, which don't exist.
And that if we're going to do any of that to support a worldview based on pleasure and pain, we'd better not waste time because life is short and there are no second chances.
I see that perspective as both liberating and as radically motivating as any religious or academic wishful thinking could ever be.