If you consider the horn to be part of a safety system then perhaps that explains why it is often operational regardless of the ignition.
I tried to find definitive information on the interweb but couldn't - I found lots of references to Audi owners where surprised their horns couldn't be used to warn an oncoming vehicle when they were parked (with the engine and ignition switched off).
I think I'm going to wire mine to "always live"
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