Take the al-Awlaki thingie for example. I always find it interesting that using drone strikes on an objectively evil group (in this case Al Qaeda) gets so many panties get knotted...
"The extrajudicial killing"... Do these people really expect that when fighting such groups, the only possible way should be to parachute in, wrestle them to ground until they submit and extradite them to the US to face a judge?
Imagine if we had to do that with the nazis