There are two types of "security and privacy violations", one is illegal and the other isn't.
If you own a home and leave the front-door open, this is not an invitation for people to walk into your house and take your belongings. You own the house and everything inside, its still your property and uninvited people are trespassing.
However, if you take your belongings and place them on the public sidewalk and leave them there, people are free to walk-up and take them, they've been abandoned on public property (obviously, if you've placed them there because you're loading up a moving van, they haven't been abandoned, but you should still be watching out for them).
If you have a wired network in your house, and google breaks in a plugs in a wire to your switch and monitors traffic, that's illegal. If you broadcast an open network that can be heard from the street, and Google simply listens, that shouldn't be illegal.
Same with peeping. If you undress in front of an open window that overlooks the street, people in the street are not peeping if they look at you. If, on the other hand, they have to scale your fence and cut-down your trees and bushes and peek through a small crack in the curtains, then that is peeping and illegal.
These people with open wifi networks are undressing in their front yards and throwing their belongings into the street and complaining that Google is watching them and taking their belongings. They have no leg to stand on, they have to assume some responsibility for their own security and privacy.