Bury it in the desert. Wear gloves. https://xkcd.com/2030/
Airplanes and elevators have computers in them but the "adversary" is gravity, which doesn't update its "attacks" to adapt to your countermeasures.
Voting systems don't just have to defend their "planes" against high winds and lightning, they also have to defend them against surface to air missiles and rogue pilots.
Seems like the argument against computer voting leaves the door open for bad actors.
Of course, some deep technological revolution might change that eventually. But in that case we still shouldn't rush to shift to a digital-only elections system. Why? Because it doesn't just have to work. Voters have to have confidence in the system. And that system isn't just technical, it's social.
Everybody understands paper. Everybody understand marking paper. Everybody understands manually counting marks on paper and adding up numbers. Further, everybody has intuitions on how to protect and defend that process by making sure the right people are present. People do generally accept machine counting of paper ballots, because they don't see that as much different, and because they know a manual count can be done if there are problems.
However technically clever and perfect some blockchain system is, it just doesn't have the simplicity and robustness in the face of attack or failure that we need. And it especially doesn't provide the social validation of what is essentially a social result.
I'd go even further and say that if voters believe in the system, it doesn't actually have to work. Belief in the system is the mechanism by which democracy provides stability. The election system actually working as advertised is only necessary to the extent that the system actually working is required to make people believe it works.
If this situation sounds completely A-OK to you then I don't know what to say.
Some people are quite cavalier about switching over to computerized voting system despite not understanding the consequences. Resisting this trend is to the benefit of society.
Explain.