There are, then, ways for a nation to soldier through angry eras. We have seen in recent times how a crisis — say Sept. 11 or the Tucson shootings — can refocus our attention and repurpose our emotions.
But in this day and age, forgetting may not be as simple — or as acceptable — as it once was. With our deep databases, powerful search engines and countless websites, blogs and bulletin boards and interminably talkative media, it is arguably easier to remember — and easier to remind others — about the inaction or injustice that originally made us mad. Really, really mad.