It isn't a problem as long as no one is betting on whether or not "bad" things will happen. However, the things that people care about (or find interesting) – a

It isn't a problem as long as no one is betting on whether or not "bad" things will happen. However, the things that people care about (or find interesting) – and want to bet on – are often heavily debated as being good or bad. This means that naive prediction markets will probably incentive some people to work towards outcomes that many view as bad.