That brings us to the real objection with Yglesias’ endorsement of moral relativism. How does one expect to appeal to the conscience of others if you accept that your own moral values are solipsistic preferances and personal tastes. How are you going to convince others, to pick a nice progressive example, that gay marriage is a moral imperative or that torture is wrong without an appeal to conscience. And, without some notion of moral truths larger than our own personal preferences, it is very difficult indeed to see how one appeals to the conscience of “the other.” Indeed, there is something profoundly un-liberal about Yglesias’ view in this regard.