I'd rather say that people only fall for fake news stories that don't run counter to their own biases. I.e. when someone is completely ignorant about a topic, and the first story they read about it is fake news, they might believe it.
In any case, you seem to be agreeing that people fall for fake news that supports their own biases, hence:
>> people in first world countries (eg, Americans, Germans, etc.) can't reliably detect fake accounts or fake news stories.
They can reliably detect whether something does or does not agree with their preexisting knowledge/biases, but that doesn't always help with detecting fake accounts or fake news.
But it's interesting you are getting so worked up defending this idea — why is that? What cognitive bruise are you protecting?