Accurately predicting the outcome of a war, election, or other nationally important event though can potentially have immense value.
I don't contest that, but again, you haven't explained why "predictions" is the point of prediction markets. People place bets on things they want to be true as much as things they believe to be true. They can market themselves as whatever they like but no one has made a case that this is any different from sports betting.
Polymarket, for example, makes money on the data. So it must be worth something because people are paying for that predication data. They don’t take a slice of the winnings.
They don’t make money by taking a spread, they make it by providing information.
And people bet on emotion for sure, but “wisdom of crowds” suggests that generally that will balance out to somewhat accurate odds.