Just putting this out there.. anytime I am in my house doing activities I don’t want others to see, we simply close these things we call curtains. They prevent people or cameras from seeing inside the room.. a little bit of effort can go a long ways to protect your privacy.
There is a legal term: "reasonable expectancy of privacy". It applies to this entire thread, though has nothing to do with vigilantism or guns. The basic tenet of the law is that you have this expectation in your own home or rented space so long as you are not viewable from public space. This means that you cannot have this expectation of privacy on your front lawn, or even from ground floor windows unless the viewer is achieving their view through mechanical assistance -- ie a ladder, telescope or a drone.
People, in public spaces, have no reasonable expectation of privacy, despite what they may think. You can take another person's picture
for non-commercial use anytime you want as long as they are in public places ie the street, park, etc. The same also applies to their children. As creepy as that sounds, it's also legally allowed.
I live in a second storey condo. All of my windows face places that are not public, and nobody can see into my apartment from anywhere public (I also overlook a small cliff). My entire apartment and balcony has a reasonable expectation of privacy. I don't need curtains. The law is on my side. BUT, if I lived on the bottom floor on the other side of the building, I couldn't make that claim.
In the OP, the people that took the picture had their
reasonable expectation of privacy infringed upon. The way to deal with this is to
call the police. In legal terms, gunplay is a far worse infraction.
The person whose drone was fired upon was legally in the right of course, even if he
was photographing the woman, as long as she was in a public place -- ie no reasonable expectation of privacy. But there are laws, and there are actions. Unfortunately, in small communities we sometimes just have to back down -- even if we're legally right. When you're likely to run into someone every day, sometimes you have to do what keeps the peace.