I understand your point, nothing is perfect, but surely a public easily-audited blockchain does more to deter corruption and, if it occurs, find the perpetrators? As compared to a traditional system which is basically a log file that anyone with access (such as a rogue IT admin) can change?
You can sign entries but unless you have each subsequent entry build on what came before like in a blockchain, entries can be removed entirely and no one will know. There is a reason companies like DHL are interested in such things.
Example: Our product is sourced from a company and this providence is on the blockchain. It comes to light they employ slave labour and we'd rather cover it up. How do we alter these original transactions without the evidence being in plain sight?
