I remember the clamour on the left and the calls for prosecutions and jail time for John Yoo, the Deputy Assistant Attorney General of the US under Bush who authored the legal rationale and justification for enhanced torture techniques. It will be interesting to see if those on the left are equally as vociferous about bringing to justice the author(s) of these legal opinions.
Bush was accused by many on the left, and their sympathizers in socialist Europe, of war crimes for the treatment and torture of detainees from Afghanistan/Iraq. I haven't heard any similar cries from these parties, nor the ACLU, but perhaps they aren't as loud and it's hard to hear them over the adulation for the chosen one.
The most troubling use of a US drone for an assassination is the one in Yemen that also murdered a young American child who just happened to be the son of an American terrorist. When a great country like America can justify the assassination of close family members when bringing criminals/terrorists to justice, you've lost the moral high ground, in my view.