Buy those stocks now that no one wants now means when the crash arrives, it crashes as well.
So until the crash arrives, it does nothing and when it arrives, it crashes along with it.
No fund manager would invest try to predict when and if the market would crash. It may not arrive for awhile more.
And even when it arrives and they are caught, it is not their money. But if they stood aside while the going is good, they can lose their career. Wall St does not cheer a bear fund manager. They will be crucified.