I think journalists know full well what they are doing when they violate people's privacy.
They see it as their jobs to "make the story continue and make some drama".
In the Leveson inquiry, Rowling commented how newspapers did their best to print identifying details of her children (which as pp noted would be available online - and of course with Rowling's wealth it is always going to be a serious security issue).
They wanted "Rowling children stalked/harassed/kidnapped" to be the next headline (and of course they could then run stories on how they were "heroes" who were supporting Rowling).
"X runs 50m in y seconds" and "X of Acacia Drive runs 50m in y seconds"? Why would anyone need to know X lives on Acacia Drive?
(and a simple fact based story wouldn't get many clicks - although congratulations
)
"Local schoolgirl gets hassled after sporting victory" would. Young women are vulnerable to lone weirdos.
The pp who mentioned that the newspaper printed her address after she complained about verbal street harassment?
It wasn't just naivete or sloppy procedure - they wanted a follow-up story (complete with sadface pic) in which she was complaining about the level of harassment increasing
(which they themselves had consciously contributed to, but they would paint themselves as the "heroes" who were speaking out on her behalf)
The media get kudos for creating a "feeding frenzy" around anything they do.
There was a journalist I met briefly socially whose own husband took me to the side and apologised/warned me about her behaviour because she just lied all the time?
She was very charming and "nice" but had form for saying one thing to one person and one thing to another in order to create a tense situation (casually passing on private information) and then stepping back and feeding off the emotional drama whilst saying "oh, dear, look what's happened, isn't it awful! just look at it!"
It is sheer spite and malice and manipulation.