Does that sound like an extremely unlikely outcome? Back in 2008, we came within hours of credit cards stopping working. Projections say that if credit cards stop working, food distribution breaks down. Mass hunger is not far behind that. And there is nothing like mass hunger to destroy a society.
Esoteric problems in financial markets have real world consequences. We've gone nearly a century since the last real demonstration of that. Don't discount the possibility that the next demonstration will be within your lifetime. And in our more interconnected world, it's likely to be a lot worse.