Also part of the reason the interference is so succesful is that America ISN'T some magical wonderland and people in the US know that, so they are inherently sympathetic to any message that says something bad about the current administration. It's a lot easier to have a strong effect in a very muddled situation than say, if it was 1944 and Americans were strongly united.

America is having pains. It's easier to stoke that fire than light one anew.