[Slartie]

The thinking behind this strategy is: there is enormous incentive to make the market perform well, which is why society will make the market perform well, with whatever means necessary. The incentive to make the market fail is much smaller (and even those shorting the market do eventually have an incentive for a well-doing market, because the money they make is worthless if it's not spendable for stuff, which depends on a well-doing market).

You can clearly see this play out right now in terms of current worldwide monetary policy: for the sake of a well-doing market, central banks are printing money like there's no tomorrow.