The difference is this guys. If a target is picked which houses civillans....

The US picks the time when the least amount of people will be inside. One reason many operations occure after dark. (Bedise cover of night)

Bin Laden picked the time when the most people would be inside. Right at the start of the day. Before people leave to meet clients. Before lunch break. Before they leave thier early morning meeting and start to work. Everyone would be there. It is the start of the day...
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