I've always wondered why nobody suggests doing that in the US to help prevent or ease people's concerns about potential voter fraud. It's simple, low-tech, and hard to screw up.
Unless if I'm missing something, which of course is possible. Can someone tell me what the downsides are to an idea like that?
In this case, Occam's Razor beats Hanlon's Razor: The simplest explanation is malice, not stupidity. The groups who are the most hysteric about hypothetical voter-fraud are dishonest. Their actual goal is not to prevent vanishingly-rare crime, but to suppress legitimate voters in a partisan fashion.
Finger-inking at the poll-site does not offer them a useful tool for skewing the election results. It imposes no special discouragement or advantage to a particular group, and it also does not create a system for arbitrary "enforcement." (In contrast, consider poll-taxes or name-similarity databases with insanely high rates of false-positives.)
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Some might retort: "I don't suggest finger-inking because it won't stop someone from impersonating another voter." True, it won't stop that from happening the first time, but it limits it to once. This means N improper votes require N humans, and as N gets large the odds of keeping it secret go to zero.
I dont get how people can just shrug off reports of dead people and non-citizens being registered to vote as a non-issue.
How many of those dogs registered to vote showed up and cast a ballot?
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If anyone actually cares enough to have a mostly accurate cost effective voter registration database, they'd reuse any one of our existing national demographic databases. But they don't. Because the recurring drama caused by our existing fragmented poorly funded more error prone system is too useful.