You have a messed-up idea of privacy, there can be various degrees of it and having a few people see you in a certain place at a certain time has a slightly different impact than having someone (potentially) analyze what you do in a large amount of your life, even if that happens in "public spaces".
I know your idea is the same as that of the USA law, but that really doesn't make it right
I know your idea is the same as that of the USA law, but that really doesn't make it right