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As far as privacy: mostly it seems people want privacy to protect themselves from bad or nosy people. That makes sense. But I think in many ways privacy is part of the problem, e.g. it hides abuse in families and romantic relationships.
Cf. the fascinating "birth and death of privacy":https://medium.com/the-ferenstein-wire/the-birth-and-death-of-privacy-3-000-years-of-history-in-50-images-614c26059e …
As far as what's my business: in general I think telling people "the thing you're doing is bad and you're bad, stop doing it" mostly doesn't work, and when it does work it's borderline abusive. I think there are better ways for us to talk about how to be human together.
("The thing you're doing is bad and you're bad" is distinct from boundary-setting: "the thing you're doing is hurting me, and if you keep doing it, I'll leave." No need to appeal to the concept of badness here.)
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