As much as it's hard to explain complex topics, I think you've touched on the most important and easiest to explain aspect of the blockchain.

The fact that it's a distributed ledger insures that no third party controls it and protects it from corruption, plus we all know that power corrupts and the blockchain system removes the incentive from that.

Luckily, many people are tired of the old system of finance and politics and at the same time, several aspects of blockchain tech can be used as a tangible solution to many problems that society identifies as such.

Maybe compelling communication is a missing key aspect so far.