With reference to the hyper-selective/condescending attitude to secondary intelligence sources, I believe the issue is rooted in the wider problem of America's position at the apex of the pyramid of cultures based around consumption/immediate gratification.
Samir Amin makes an aside in his book "The Liberal Virus
ermanent War and the Americanisation of the World" which I see as relevant to the US power elites' seeming inability/unwillingness to engage with outside intelligence sources and/or "bearers of bad tidings". Amin says:
"...one of the major weaknesses of American thought , resulting from its history and its ideology, is that it has no long-term vision. This thought is embedded in the immediate, about which it collects an alarmingly large quantity of data.It believes that it can clarify its immediate choices exclusively through the analysis of "the present", always judging "the past" as irrelevant (the expression 'it's history' is an American synonym for 'without importance'). The future, in these conditions, is always conceived as the simple projection of the immediate."
IMHO f you exist within (and indeed propagate, if you're part of "the system") a culture that constantly lauds immediate gratification and a worship of "the present" over learning the lessons of the past in order to more accurately project the future, why
would you choose to give credence to "bearers of bad tidings"? I don't believe that your mention of a systemic attitude of self-absorption and arrogance goes far enough. I believe that there's no more and no less than a situation in play that sets up such a cognitive dissonance in members of the US power elite that, while many
know that it is irrational, they're unable to give acknowledgement to anything but their own hypotheses and views supportive of those hypotheses, because their cultural imperatives demand that gratification is not delayed.
</end of rant>