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1. Fundamentally what is wrong with being spied upon?
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Why are there doors and walls on bathrooms and showers?
>>2. What is the problem with the “I have nothing to hide, who cares?” argument? (Or, if you prefer, you are most welcome to defend that position.)<<
There are several reasons, but the most practical is that what you say or do is subject to INTERPRETATION that may make your private acts public.
It is why you should NEVER let police check your car without a search warrant (say “Office, I do not consent to searching my vehicle. Am I free to go?”).
Why are there windows in bathrooms and clear glass shower doors?