Killing your military targets with a drone is very different from killing protesters in the streets with snipers. Also, the killing of citizens of other countries is sad, but when a government kills its own protesting citizens, that government is the most brutal government.
Discussion
Fair. I wish there was a source other than that amnesty international release which is quoted everywhere. I have seen too much propaganda and outright lies in the western press to be able to just trust that this happened based on one source.
Here's an article on RT that takes the very different view. They have an agenda, no doubt, but I am yet to see them completely fabricate a story e.g. like the guardian did about the Manafort Assange visit.
https://www.rt.com/news/584740-iranian-women-fight-propaganda-war/
the 'military' target is your own civilian
I don't remember a case where US killed its own citizen with a drone.
https://www.wikipedia.org/wiki/Killing_of_Abdulrahman_al-Awlaki
the us gov will anyone it wants and plenty of others in the process