Jackson Diehl, a member of the editorial board of the Washington Post and an op-ed columnist, has a must-read piece in today’s Post. How rare is it for a columnist to change his mind and admit error? If you take a look at Diehl’s columns on Israel, especially in 2002, you’ll find a constant questioning of Sharon’s hawkish tactics and predictions that Sharon’s invasions of Palestinian territories were only adding to Israel’s security threat. Of course, if the security situation in Israel worsens, Diehl would probably abandon his new respect for the effectiveness of military force. But at least he’s flexible, which is a lot more than you can say about many of the major columnists.