I've been on the forums long enough to run into plenty of situations where users ran into information, or a previous person reappeared, and nobody made archives in that moment, or had made archives in the past. There is literally no point to reporting someone over this. The moment that user is being posted about in public, there is now a countdown to the moment they DFE. Trying to sit there and report people over not archiving is time wasted when you should be doing it.
Should they have? Sure, but it's infinitely more productive to quickly get to work archiving and call them a dumbass when you finish. It's a community/team effort.
I've reported plenty of posts. I've even reported myself in the past because I didn't have an edit button or didn't notice an error until a few hours later, and it's never been a problem. You might get called a dumbass at some point but if you're being called out like this, it's probably on you.