Sure - but a lot of systems have a safety net of test environments and change control, and a safety net as they can revert changes, and a safety net as they can restore backups, and a safety net as they can ask counterparties nicely to help undo things, and a safety net through the legal system, and a safety net of insurance.

The normal banking industry is operating chainsaws very cautiously, with a lot of safety equipment and training. The cryptocurrency industry may be operating the same chainsaws, but they're trying to juggle them naked, on a floor slick with the blood of their peers.