This is because I/P is sufficiently complicated and brutal that for any involved party X (Arab countries, Israel, Palestinians, Britain...), an interested party can make party X seem "inhuman, clearly we should defeat X anywhere we find them" to someone not previously informed on the topic.
So even if we don't select the evidence, or even select the date, but just selectively amplify, propaganda about it works just fine, across different media. The LLM news here is that as a media, LLMs transform biased background knowledge into eloquent confident _and tailored_ arguments for the bias, like a suave but motivated news anchor that is able to converse individually with _every listener_.
Because for all X, someone _is_ already amplifying the message "hate X", the main outcome of LLMs+Propaganda is not hate for a specific X, but just more hate.
And the solutions? The authors' ledger+timeline+blame+semantic checks are not a bad place to start.
For me, the core is that often the enemy we can and should defeat is not people, it is memes, like "hate _". LLMs (among other effects, good and bad) whitewash memes, and we all better be prepared to defend ourselves against their influence.