Okay, fun's over.
We let mods (namely, Autosaver and Mags, among others) lock the topics that are deemed too volatile or primarily useless.
This is done mostly with a written report (prior to lock often) addressed to the staff here in TFX for a consensus.
Locking is a secondary choice over post deletion.
It is intentionally left out for other members to see why that particular thread is locked.
I personally delete unnecessary posts and comments, or those that are too hostile towards another member.
A few may notice it, but I do it.
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P.S.
For the sake of all humanity, try not to spam the GUEST Q&A sub-forums.
It's a public relations thing, and a simple sense of discipline (and choosing the right words to say) would be fine once in a while.
This appeal applies to everyone.