I processed a lot of the reports, and removed the threads. Probably handled 100-200 of the reports. However, I only removed those that did not have any replies at all, had not trust references directed towards the thread itself, i.e one's which basically offered no value whatsoever. I left some in the queue towards the end of the night, due to needing to attend to some real life things.
Having said that, I wasn't the one to mark any of the reports bad. In fact, I left the one's which did have replies as a soft bad, by just leaving them unhandled, because I can see it from both points of view. The global moderator who handled these reports, must have thought they could've been significant to the history of the user, in some way I imagine.
Generally, we don't allow users to remove their own threads, and I guess this could potentially be abused. However, since there was no replies or any trust references/flags left, I thought they were insignificant enough to be removed. Maybe, whoever handled them had a different point of view to that.