What is the reasoning behind the smaller radius vice presidential TFR?

Larry Dighera writes:

Is it just arbitrary, or an absurd "mine is bigger than yours" thing?

Unfortunately, a great deal of security for public personalities is
indeed based on a "mine is bigger than yours" form of reasoning. This
is especially true for _visible_ forms of security, such as the TFRs.

Often the security isn't there to protect anyone, it's there to announce
to everyone else how important a person is.

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