https://www.realclearmarkets.com/articles/2021/01/28/dismiss_all_the_populist_gamestop_hype_short_sellers_are_heroes_658260.html
Back around 2007, investor John Paulson began to feel skeptical about the viability of mortgage securities. Though demand for them was much greater than supply, Paulson sensed that lending standards had plummeted so far that loan delinquencies were set to surge. The “third rate” hedge fund manager (that’s what those who covered him at top investment banks felt) proceeded to very inexpensively purchase insurance on mortgages. He was able to because the consensus in the marketplace was that he was very wrong.
As readers know, Paulson was subsequently vindicated in 2008. Funny about the billions he made on his bet was that all-too-many looked askance at his remarkable gains. Paulson was said to be profiting from the pain experienced by borrowers and lenders. In truth, Paulson was a hero.
His major investment gains sent a crucial signal that lenders should shrink their exposure to home loans. Realistically billions were diverted from a form of lending that, at the time, was no longer viable. Translated, Paulson’s billions helped avert what would have been a much bigger economic crash if the faulty lending had continued.