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Con: Voting systems not only require confidentiality, integrity and availability, citizens must have confidence in those properties. Very few people understand blockchain; it would be a mumbo-jumbo black box to almost everyone and invite suspicions of tampering, manipulation by politicians, and actual tampering.

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Yet people gladly trust TLS when they're making online purchases, despite many of them having no understanding at all of how it works beyond the little green lock on their URL bar.

Lack of understanding should not be a deterrent. If it's a public blockchain-based system, people can use open source clients that are coded by an entity they trust (like people use Firefox, Chrome, Edge, etc. for web browsing). If people don't trust the blockchain clients, it's likely a UI issue.

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