THE United States has just spent thousands of American lives in a distant land for a victory that now seems hollow, if indeed it can be called a victory at all. Our own country, moreover, is emerging from a recession, dispirited and self-absorbed, worried about the fragility of the recovery and the state of our democracy. Idealism is in short supply. So, as another far-off war worsens, Americans are loath to take sides, even against a merciless dictator, even to the extent of sending weapons. The voices opposed to getting involved range from the pacifist left to the populist right. The president, fearful that foreign conflict will undermine his domestic agenda, vacillates.