On the other hand we have had stock markets forever. Sure you couldn't directly bet on e.g. if trump would invade iran, but you could indirectly bet on it by betting on things like the price of oil.
I dont think this is a new threat.
It was the crash of the stock markets that eventually created the social situation that pushed people into WW.
Comparing crusty old stock markets to the mass appeal of shiny, low-barrier-to-entry Polymarket is somewhat naive.
It's all fun and games until someone decides to bet $100K that someone they don't like won't die via assassination this year.