A growing number of senior United States intelligence and counterinsurgency officials say that by bunching up there, insurgents are ultimately making it easier for American drone strikes to hit them from afar.

American officials are loath to talk about this silver lining to the storm cloud that they have long described building up in the tribal area of North Waziristan, where the insurgents run a virtual mini-state the size of Rhode Island. This is because they do not want to undermine the Obama administration’s urgent public pleas for Pakistan to order troops into the area, or to give Pakistan an excuse for inaction…

With several hundred insurgents largely bottled up there, and with few worries about accidentally hitting Pakistani soldiers battling militants or civilians fleeing a combat zone, the Central Intelligence Agency’s drones have attacked targets in North Waziristan with increasing effectiveness and have degraded Al Qaeda’s ability to carry out a major attack against the United States, the senior officials said.