Earlier quoted context omitted.
Extrajudicial targeted assassinations are pretty far on the bad side, no matter how few other people get killed in the process. Sure, if you are doing it, killing fewer bystanders is preferable on the surface. But if individual assassinations are less likely to cause an international outcry since fewer people died that likely leads to more assassinations.
Isn't the US is, like, at war in Syria? Wars being a terrible thing and all, one won't expect a speedy and fair trial on a battlefield.
It's mainly a local conflict with the superpowers backing different factions. Kind of like a proxy war during the cold war. A lot of countries backing opposing local factions while trying not to escalate.
A full blown declaration of war would give us WWIII in no time due to it being such a complex mess of alliances they're.