Tommi Uschanov and Reshef have a nice discussion here about what Wittgenstein might mean when he talks about the absolutely right road in the Lecture on Ethics. Tommi provides a link there to this essay by Arto Tukiainen. Tukiainen writes:
Wittgenstein himself connects ethics with logic when he compares absolute goodness to an absolutely right road that everyone chooses with logical necessity after having become aware of it (1965, 7). He qualifies this by saying that if we don't choose absolute goodness, we feel guilty. One might wonder how it is possible to feel guilty for not choosing absolute goodness if choosing it happens with logical necessity. Is it not the case that not choosing absolute goodness and feeling guilty about this excludes choosing it and being happy? So how can choosing absolute goodness happen with logical necessity? How can Wittgenstein compare absolute goodness to a road we choose with logical necessity? (p. 105)There seems to be a mistake here. Wittgenstein says:
I said that so far as facts and propositions are concerned there is only relative value and relative good, right, etc. And let me, before I go on, illustrate this by a rather obvious example. The right road is the road which leads to an arbitrarily predetermined end and it is quite clear to us all that there is no sense in talking about the right road apart from such a predetermined goal. Now let us see what we could possibly mean by the expression, "the absolutely right road." I think it would be the road which everybody on seeing it would, with logical necessity, have to go, or be ashamed for not going. And similarly the absolute good, if it is a describable state of affairs, would be one which everybody, independent of his tastes and inclinations, would necessarily bring about or feel guilty for not bringing about. And I want to say that such a state of affairs is a chimera. No state of affairs has, in itself, what I would like to call the coercive power of an absolute judge.I take the alleged logical necessity to be, not that one takes the absolutely right road, but that one either takes this road or feels guilty. So there is no need to wonder "how it is possible to feel guilty for not choosing absolute goodness if choosing it happens with logical necessity". Choosing it does not happen with logical necessity. (Unless I'm misreading the text.)
It's interesting that Wittgenstein says that there is no such state of affairs. How does he know? He goes on not to give evidence (unrepentant murderers, etc.) but to ask what people, including himself, who still want to talk about absolute value have in mind and mean to express. And he thinks then of cases in which he would use such language. Here he starts talking about psychology, and certain kinds of experiences, in the hope that the audience will call to mind similar experiences of their own. (This all sounds like the kind of thing he later recommends not doing in philosophy, although given his particular purpose here perhaps even his later self would be OK with it.)
When he considers these experiences the first thing he has to say is that their verbal expression is a nonsensical misuse of language. These experiences seem to people like him to have "in some sense an intrinsic, absolute value." But a few lines later he concedes that, "it is nonsense to say that they have absolute value." Shortly after that (I'm going through this too fast: one day perhaps I'll write a line-by-line exegesis) he realizes that nonsensicality is the essence of the expressions he is concerned with.
I think, then, that it's not an accident that there just happens to be no state of affairs with the power of a coercive judge. Any such state of affairs, if it did exist, would not be what is wanted. An object or person that made one do what it wanted or else feel mental pain would be evil (cf. Kant, who, however, doesn't say exactly the same thing, and this from Wittgenstein: "If I thought of God as another being like myself, outside myself, only infinitely more powerful, then I would regard it as my duty to defy him." (Recollections of Wittgenstein, ed. Rush Rhees, Oxford University Press, 1984, pp. 107-8)--quoted here). To see what Wittgenstein means to help you see, though, you ought to go through the twists and turns in the lecture.
One final note. The first paragraph of the lecture (there are two in all, the second being the longer) ends thus:
My third and last difficulty is one which, in fact, adheres to most lengthy philosophical lectures and it is this, that the hearer is incapable of seeing both the road he is led and the goal which it leads to. That is to say: he either thinks: "I understand all he says, but what on earth is he driving at" or else he thinks "I see what he's driving at, but how on earth is he going to get there." All I can do is again to ask you to be patient and to hope that in the end you may see both the way and where it leads to.This, again, warns against relying on a summary of what the lecture says, but it's possible that it isn't just a coincidence that Wittgenstein uses a road metaphor here as he does in explaining what he means by "absolute value," etc.