WE don’t like our evil to be banal. Ten years after Columbine, it only now may be sinking in that the psychopathic killers were not jock-hating dorks from a “Trench Coat Mafia,” or, as ABC News maintained at the time, “part of a dark, underground national phenomenon known as the Gothic movement.” In the new best seller “Columbine,” the journalist Dave Cullen reaffirms that Dylan Klebold and Eric Harris were instead ordinary American teenagers who worked at the local pizza joint, loved their parents and were popular among their classmates. On Tuesday, it will be five years since Americans first confronted the photographs from Abu Ghraib on “60 Minutes II.” Here, too, we want to cling to myths that quarantine the evil. If our country committed torture, surely it did so to prevent Armageddon, in a patriotic ticking-time-bomb scenario out of “24.” If anyone deserves blame, it was only those identified by President Bush as “a few American troops who dishonored our country and disregarded ou