Considering there are few Arabic mainstream news networks that aren't funded by US vassels, it's honestly not unexpected that people would be fooled. They have no counter narrative, and never even interact with Shiites unless they are in a country that has a sizable population if them.
It's still infuriating seeing my Sunni companions snub me over a sectarian farce, because they'd rather believe the largely corrupt Gulf funded media over siding with Iran.
Though today the media landscape is quite different. Online media like telegram, whatsapp, and social media have a larger influence then mainstream media I believe, so perhaps these efforts are losing their effectiveness.
Unfortunately, AJ has gained a lot of clout from their Palestine coverage, which they are utilizing to deceive the masses.
I'd say the material reality of Israel's actions would be the largest motivator, but I'm not sure the sectarian hatred can be overcome.
They could go the Qanon route and just make all their conspiracies about Russia rather then "the deepstate".
Maybe the majority of Americans will have selective amnesia, as they do every few months, but committed libs may as well be a cult just as delusional as MAGA.