Christ, just say you are conservative and don't like unions and their political stances. 'Accuracy' doesn't matter at all when it comes to assessing harm, but the existence of a market signal itself can change outcomes, and then much vaunted 'accuracy' becomes a mechanism for fraud in a new and different way.

Even taking your nitpick a little bit seriously, behold:

> Retail prediction market traders pick winners 51.3% of the time yet lose money; automated traders achieve coin-flip accuracy yet earn $133 million.

The entire enterprise exists to move money from gamblers to companies. The externalities (suicide, social degradation) of this transaction is bourne by society.