They may not have a legal right to bomb. Depending on the details of the situation, I'm not sure where to draw the lines between warfare and war crimes. And I am not even considering the fact that some operations were conducted on foreign soil without consent from the local government - another can of worms.

And I will ask another question: why bombs? Why remote drones? Why is it impossible to use other means? The assassination of Osama bin Ladin was carried out by soldiers on the ground, after all.