How would they go about accessing it? Presumably people can protect information they deem private. Like their social security number for instance.
BTW, thanks for engaging in this discussion. It's important and it's helping me rethink through all of this.
Another option is making a fake ballot. The local newspaper used to helpfully publish their suggestion of how a devout left wing progressive would fill out their ballot. They're currently the establishment, so they're likely to be the largest problem, and its solved right there.