"The Sermon on the Mount is not a treatise on government. Governments have rights and responsibilities that individuals do not."
But what is government other than a conglomeration of people? Why is there one standard for individuals but another for governments? If one believes in the Sermon on the Mount then why wouldn't one insist it apply to groups of people (i.e. governments) as well as individuals? You've described realpolitik and I understand that, but I think what Dr. Gushee describes, and what many posters on this board felt, is that we are called to forgive our enemies and mourn all destruction, no matter how justifiable. This is extremely difficult, maybe the hardest part of being a Christian, but certainly it is worth valuing.
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