Because I’m saying the threat vector you used to justify it is not an issue for me at all, so it’s a baseless justification for “security”, ergo, theatre.
That's still not theater though. Annoying? Yes, quite! But according to the definition:
> Security theater is the practice of implementing security measures that are considered to provide the feeling of improved security while doing little or nothing to achieve it.[1][2]
Adding additional security to something that doesn’t need security is basically doing this by definition. It’s adding nothing because nothing was needed. So yes, theatre.