Blockchain and Data Privacy

There are many businesses considering putting data (supply chain data) on a blockchain but not much conversation of the liabilities this presents.  In most blockchain architectures, all the data on the blockchain is actually held by all the nodes on the network and then each of these nodes has the power to lose this data in a breach.  Given how much trouble the world is having protecting data stored on centralized servers, reproducing the data many times is likely to produce an unprecedented data privacy crisis as multiplication of opportunity produces a multitude of new breaches.