Just because Denic doesn't allow private domain registrations doesn't mean you're supposed to go after people and dump their personal info into your popular blog. Large parts of the information was historical data persisted by third parties that'd be hard to expunge. There's a good reason for pr0gramm admins to want to remain anonymous - cha0s initially quit the site because he received an 80kg steel oven as sort of a threat. The post includes names and contact information of volunteer moderators that weren't even part of their company.

But Brian Krebs' private information - which is definitely out there - is to be kept out of public view? I'm sure he'd pursue legal action if I put that on my blog with some half-baked accusations

It's wrong, plain and simple, which is why pr0gramm moderators have been removing posts with both their own private information and krebs'.