If any of you have seen die hard 4, the villian tries to destroy the entire electronic database system, wiping out all bank accounts , information, etc.
Realistically what would it take to delete all banking system data? any clue on how many backups they have, where everything is stored, etc? Same goes for the stock market holdings.
It's just numbers on a screen/paper, what would it take for everything to be wiped out?
As an evil strategist, I don´t need to wipe out all records, I just need to create enough distrust among the participants in the system to make many of them unsure of what is real and what is not, what transactions came first and which later and if the claim of having credit to order payments are legitimate in this instant.
You see, there is a real use case for a blockchain to prevent that.