"Bin Laden had become almost an irrelevance, they could quite easily have left him to pass away whatever time he had left in a hole in Pakistan,"

Is there not a case for justice against a mass murderer?
Reprisals?
You would have to believe that they were holding back for some reason.
All they might do is bring forward an attack planned anyway.
That means it is less likely to succeed.

This man said all Americans deserved death without discriminating between military and civilian.
He did kill thousands of you.
He was your enemy.