Good column by Thomas Sowell.
Yet, precisely because it is an election year, elected officials will be under great pressure to "do something." The old saying, "Marry in haste and repent at leisure" may turn out to apply to a hasty marriage of intelligence services in the heat of a political campaign.
Behind all the emphasis on "intelligence failure" is a notion that surprises can be prevented. Some can and some can't. There are too many possible targets and too many ways of attacking them for even the best intelligence agencies to discover all threats in time to keep them from being carried out.