Pencil and paper solves the trust issue. And the issues of security around paper voting such as it's security, lots of guards, public counts etc, costing a bit more, are better understood than SSL, layer 1,2,3,4 securities, and verifiable systems.
However, it's beyond simply the public needing simple systems; the number of experts that would be required to lie about the certainty of a system is low enough that you really do create a less secure system. Paper ballots are harder to cheat because the systems scale in a way that you require more people in on the heist, which is the hardest part of any scam.
Scrutability and accessibility go a long way in establishing trust. Putting elections behind technical complexity does the opposite.
Online scams are a human problem, not a computer problem. People also get scammed via telephone. If someone asks you for your CC number and you give it to them, then the medium is not that important.
There’s nothing in the human evolution that would prepare us for nonstop phishing attacks.
It absolutely is a computer failure because we haven’t changed, they have.