From our perspective common people aren't responsible. But from the perspective of the person who wrote the "your decision to arm Russia" on their website it is.

So what is interesting is that this person is fully able to assign blame to individual Iranians for their government's actions but, one would imagine, is able to separate themselves from the actions of the US government.

I wrote "one would imagine" because there was no reply so we cannot say for sure. But my experience with Americans who do this "all Iranians/North Koreans/Syrians/Iraqis etc are bad!" thing is that they carve out little exceptions for themselves and the USA so that their reasons to hate others never seem to apply to themselves.