I don't think these examples are quite security theater. A good bike lock makes your bike harder to steal; a "theatrical" bike lock would mostly just make it look harder to steal. Even a skinny cable lock, the sort you can cut with fingernail clippers, keeps it from being stolen by passers-by who don't have fingernail clippers.
(Of course, the same argument applies to the TSA, so maybe I'm just wrong about what "security theater" means.)
Exceptions (which I think is what you mean by edge cases) DO indicate that a rule is incomplete or not universal.
Yes! But rules don't have to be complete or universal to be acceptable.
Rules about people should be more formally correct than is implied by this post.
I think I see what you're getting at. My instinct kinda runs the other way, though: if people don't fit neatly into categories (and you care about the edge cases), it might be better to throw out the rule entirely rather than formalize it and categorize those edge cases. Could you give an example of where formalizing would be helpful?
If the counts weren't public until after voting were closed, do you think people would vote significantly differently?
My instinct says they wouldn't.