Security theatre often refers to security from physical threat. I'm not talking about undetected fraud in a sense where that makes sense, but rather a verifiable, auditable process.

The only thing you referred to that was process related (versus physical security) was use of encryption keys. Why not talk about the pros/cons of that?

> It seems that you think, for voting, that's a fine trade-off

With respect to x-ray screens? Not at all, nor did I say such a thing. Nor do I think all things that could be described as "security" are exactly equivalent to each other, such that you can mention x-ray scans, and the argument automatically extends to RSA keys.