I did say that in-group, authority and purity are necessary for the maintenance of order, but I would never give them a blanket endorsement.
Morality binds people into groups. It gives us tribalism, it gives us genocide, war, and politics. But it also gives us heroism, altruism, and sainthood.
If you have a personality predisposed to liberalism, you might gravitate more to the artsy crowd or the anti-establishment crowd. And then those peers will affect you, and they will give you values, and you will copy them.
If you get something for nothing, part of you may be pleased, but part of you moves your hand to give something back.
Scandal is great entertainment because it allows people to feel contempt, a moral emotion that gives feelings of moral superiority while asking nothing in return. With contempt you don't need to right the wrong (as with anger) or flee the scene (as with fear or disgust). And the best of all, contempt is made to share. Stories about the moral failings of others are among the most common kinds of gossip, they are a stable of talk radio, and they offer a ready way for people to show that they share a common moral orientation.