This reminds me of the "legibility" problem in voting. Perhaps in theory it's possible to hold a magic unhackable blockchain-based secret-ballot-preserving cryptographically-secure digital election, but the average voter cannot be convinced of its security without teaching them tons of CS concepts (can you imagine trying to explain trapdoor functions in a voters' pamphlet?). Meanwhile, paper ballots can go into a tamper-proof box with a big lock on it--which has "security" written all over it figuratively, if not literally--and you can record video of every time the box moves and invite observers as you count the ballots. Up until very recently, this was so obviously secure that anyone saying otherwise would be considered a lunatic.