Do you consider all things broadly called "ethical" to be similarly a waste of time? Even if we lived in a world where everyone always behaved unjustly, because of some like behavioristic/physical principle, don't you think we would still have an idea of justice as what we should do? Because an ethical frame is decidedly not an empirical one, right?

We don't just look around and take an average of what everyone is doing already and call that what is right, right? Whether you're deontological or utilitarian or virtue about it, there is still the idea that we can speak to what is "good" even if we can't see that good out there.

Maybe it is "insane" to expect meaning from something like this, but what is the alternative to you? OK maybe we can't be prescriptive--people don't listen, are always bad, are hopeless wet bags, etc--but still, that doesn't in itself rule out the possibility of the broad project that reflects on what is maybe right or wrong. Right?