Proverbs 26:4-5 (ESV):
Answer not a fool according to his folly,
lest you be like him yourself.
Answer a fool according to his folly,
lest he be wise in his own eyes.
I blogged about one aspect of this tension not long ago. Sometimes it really isn't a good idea to answer the fool according to his folly. It's not good to be like the fool. That's why when Paul starts to drip with sarcasm as II Corinthians goes on, and he keeps addressing the foolish arguments of the triumphalists on their own terms, he keeps saying that he's speaking like a fool. Yet sometimes it's best to address the fool according to his folly, as Paul very much does in II Corinthians. Sometimes the point can be made another way, but making it on the terms of the fool provides the emotional and rhetorical strategy necessary for the fool to see the point.
Joe Carter takes the second road in addressing the issues Bush's war for oil, and he does it well. This argument was never based on anything more than a suspicion on the part of those determined for Bush to be evil, but it's becoming increasingly clear that the suspicion on which it's based is pretty far from Bush's real motivations. Whatever you say about just cause (on which I happen to think a good defense can be made), the charges that Bush fails on right intention don't seem very likely. I wasn't as confident of that at the beginning, but I was willing to trust the president. That trust has been vindicated.