anothername: If it gets deleted everything is fine; if not there is either to much power in not enough hands or the before mentioned low-rep-bot-script at large for certain users.
Incorrect. If it got deleted quickly, it could suggest that the deletion process allows collateral effects and is imprecise. If it gets deleted after a while, it could suggest that threads which develop unacceptable content can suffer for potentially unintended consequences. If it does not get deleted at all, it could suggest that the deletion process is working as intended.
Because free-speech hand-wringing aside, and ignoring the relevancy of such notions in private spaces like this forum, there's one topical and salient rule that generally applies to public and private places alike: even if you're free to say something, other people are free to treat you like an asshole if you're being an asshole.
The bot-script army argument/discussion is a classic example of "silent majority" fallacy. A far simpler explanation is that threads are getting deleted because numerous people find them offensive and have the ability to remove offensive content. Since almost all content in a forum is opt-in, and since at least a few threads and posts with useful content have been removed, there's good reason to believe the spam-reporting feature is being used too broadly. But that doesn't mean that in the local context it's being used improperly. And it certainly doesn't mean there's an army of automation. The fact that trouble threads get removed at varying intervals strongly suggests there is no significant automation.