Publishing information on a particular private individual because the public's benefit is sufficiently great is a hard line to even vaguely pin down - a home address, all private contact methods, and enough personal data to forge their identity on a passport application is probably never warranted to publish, but you're going to acquire that information while researching private citizens for any reason, and then pare it down to the minimum required to establish whatever story you're reporting on.
One might distinguish "doxxing" as "publishing all the information you can retrieve", without any filter or goal other than making the information as public as possible.
NB: I'm not claiming these rules are good or bad. But it's not like only freaks that are members of The Other have concerns about doxxing.
There exist numerous reasons to not love the idea of one's personal information, particularly regarding one's work or home, put out there broadly, particularly when it is attached to information one does not control and/or in a circumstance which would tend to show it to people who do not respect standard middle class norms of detachment. Redditors did not invent concern over this issue. Many of the people with strong concerns about it are demographically dissimilar to the modal Redditor.
Edit to add: It occasionally happens that journalists will transgress upon society's norms in this area and persons sympathetic to the aggrevied parties will transgress back. I have not heard a journalist say, in response to that "OK, fair commentary, wot wot." This often comes up in the context "We have published gun owners' addresses because the public has a right to know who owns guns." "We have published your address because the public has a right to know who writes newspapers."
I feel like I've read that story ~5 times over the years. First Googleable citation: http://www.nytimes.com/2013/01/07/nyregion/after-pinpointing...
Because that is what the comment to which I replied upthread claimed.
The fact that this guy on one hand built an incredibly high quality application that had and has a major positive impact on the world is a story that needs to be told.
The fact that he's a damaged, amoral man who is allegedly a career criminal and drug dealer is a story that demands to be told. He represents the Id of mankind -- and personifies the paradox that perfect security and privacy benefits society at large, and that society also includes the bad guys.
This all occurs to me as a show trial. They're making an example of him, as authoritarian systems tend to do. And one aspect of that is being dragged through the mud. Being slandered. It's dog pack behavior, and I find it disgusting.