HN isn't a technical-only site. Never has been.

Indeed, and even if someone wasn't interested in the historical value of what was lost, there's still the matter of the process failure that allowed it to happen (or covered up that it was happening, depending on your level of cynicism).

It got on HN one year ago too https://news.ycombinator.com/item?id=23376236

They are coming to Serbia, shit will happen!

What is "outrage wallowing"?

I see - "wallowing" implies different parties and motives than the more normal concept of getting outrage-driven clicks. However, this doesn't seem to have anything to do with outrage media. It's a pretty reasonable thing to report on, and it's reported on pretty reasonably. It's both important and interesting, so the fact that it is also outrageous seems irrelevant to the implication that it shouldn't be observed or commented on. You might make an argument that nothing old should be posted, and I would disagree, but that too seems like an argument unrelated to whether or not something is outrageous merely for the sake of getting clicks.