In a public blockchain future, a transaction can only take place if it is from a trusted and verified source. Every transaction is recorded with source, destination, transaction information, date, time, and more. That set of data is distributed across thousands of systems with no single point of control or failure. All of it is traceable and can be easily peer-audited, without any need for human involvement.
We can have a financial industry absent the numerous games and frauds committed by numerous institutions leading up to and in the wake of the mid-2000s recession.
We can have trusted voting and election systems, absent either the voter fraud or election fraud you believe exist (or may actually exist), depending on which “side” you’re on.
We can trace every last cent in politics.
We can trace every last cent in war.
Identity theft, financial shell games, money laundering, tax evasion, foreign money in another nation’s elections, mortgage fraud…
Each and every one, all but eradicated.
For a basic primer on blockchain technology, read “What is Blockchain Technology? A Step-by-Step Guide For Beginners” at Block Geeks: https://blockgeeks.com/guides/what-is-blockchain-technology/