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Other countries don't have this problem because they don't have the free for all media landscape that the US does.

For example, in virtually every other country there's a well funded public broadcaster. And, even when that public broadcaster isn't dominating the viewership, it's normally seen as the most trustworthy news source. So, people can watch their favourite news channel, but when they want to fact check something they know they can tune in the public broadcaster.

Other countries are also not as insane as the US when it comes to defunding public education. Having a population that is able to tell fact from fiction is seen as important by most other countries, even if that means slightly higher taxes. The US sees well funded education as communism, and is trying to get rid of it, or defund it at a minimum.

The US is also one of the only places with a true 2-party duopoly with no other options for voters. Even in countries where only 2 parties have a realistic chance at forming a government, there are other parties that siphon off the crazies, and/or put pressure on the mainstream parties from both left and right.

I've lived in 4 other countries and have visited dozens more. The US is truly unique, and not in a good way. I'm not saying it couldn't happen somewhere else, but it's much more likely to happen in the US because of unique US dysfunction.