See, people don't like others having their info because people aren't as good as they should be anymore. It's a different, more dangerous world with more violent, obsessive people in it, and because half of the population is too stupid to know to protect themselves, they need a law or act to tell then what to do to protect themselves. Just like the proposed internet filters for Australia, which would mandatorily filter the internet to something like a PG-15 level at its very worst, and to get those removed you need to APPLY to have them removed and tell the government why. Because apparently, nobody else sees the logical course of having families able to opt into it to protect their children if they wish - no, if it was optional, people would stop at the word "filter", assume it's 100% bad for everyone, and skip it, because they're loving stupid. So, to protect the stupid parents children for them, the government would need to filter out everything on a mandatory basis. loving stupid, aye?
tl;dr: People are loving stupid, so things are stufftier for the smarter quarter of the population.