I had something similar happen, where I offered details on a fix, and provided a link to more details. Someone removed part of my fix text, then someone else removed my link (it wasn't relevant without the fix text), and then a third person removed the comment entirely because it didn't offer a fix (without the link and the text, it was basically worthless).

So stackoverflow went from "having a useful answer" to "having no answer at all" because folks abused their use-granted power.

I am personally fond of the "king for a day" form of crowd-sourced moderation, where folks who are granted moderation say don't get to keep it long enough to get used to it, and learn how to abuse it.