This strongly asserted but ...

This strongly asserted but ill-defined license to kill without accountability is not an entitlement which the United States or other states can have without doing grave damage to the rules designed to protect the right to life and prevent extrajudicial executions.
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 Philip Alston

Quotes from the same author

Because operators are based thousands of miles away from the battlefield, and undertake operations entirely through computer screens and remote audio feed, there is a risk of developing a 'PlayStation' mentality to killing.
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 Philip Alston
The problem with the United States is that it is making an increased use of drones/Predators [which are] particularly prominently used now in relation to Pakistan and Afghanistan...My concern is that drones/Predators are being operated in a framework which may well violate international humanitarian law and international human rights law.
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 Philip Alston