Earlier quoted context omitted.
Assuming you're a US citizen, to what degree are you personally culpable for the illegal behaviour of the current government? How responsible are you for the recent extrajudicial murders committed by the USA?
I'm not sure why you are making this assumption, but assuming you are not trying to derail the discussion with the usual whataboutism argument, and taking your question at face value, the answer would be "yes". A citizen of any country should feel responsible for the actions of their government, vote, and take action when things begin to get out of hand. Dictatorships are rarely created overnight, they usually begin…
I would never expect the average Iranian to take up arms against the Revolutionary Guard, for example. I wouldn't, if it were me. I don't feel such patriotism that I feel responsible for my country's actions. I don't feel that I am personally culpable in any way for, for example, the extrajudicial murders of Afghanis by Australian Special Forces in Afghanistan.