From a really helpful essay by my colleague David Corey:

Some people I know worry that genuine friendship is less possible in a pluralist age than in contexts where citizens share a robust conception of the good, or of God. But this is not my view. From experience I have learned that friendship does not require that friends love all the same things, much less that they love the same ultimate things. Friendships based on such common loves of course do exist, and perhaps they are of a higher order than those in which ultimate truths are not shared. But friendship is possible where what is loved is simply the person, not the person’s metaphysics or theology. Pluralism thus need not be the death of friendships that are genuine and deep.

But if pluralism does not render meaningful friendships impossible, the tendency to understand politics as a form of war certainly makes them less likely. That was the claim I supported above by distinguishing between friendship and allyship. The second claim I made was that how one understands friendship can affect how one practices politics. Why would this be so? It is because the experience of genuine friendship, which is not merely an intrinsic good but a peak intrinsic good, cannot help but put politics in its place. Politics today makes great claims about its own importance. Yet politics cannot bring meaning to our lives — not deep meaning at any rate — because it is never more than an instrumental good.