Dave Kopel has an excellent analysis of the various schools of modern Christian pacifism and how they are largely founded upon factual errors, moral inconsistencies, and apathy.
He examines the pacifism of Leo Tolstoy, Tony Compolo, Thomas Merton, Stanley Hauerwas, and John Howard Yoder. Kopel admires Yoder for directly addressing arguments against pacifism, but finds that Yoder compromises authentic pacifism in order to answer them.
Of particular interest is Kopel's evidence that Martin Luther King Jr. viewed non-violence as a tactic, not a universal principle.
I highly recommend this article.
Hat tip: Volokh Conspiracy