I suppose a distinction can be drawn in the type of degeneration. Is it degenerating in content or in mood. I can quite see that if the content is so very offensive that "an average person" (the legal yardstick) would be offended and repulsed, the mods should quite rightly remove any material which is offensive or repulsive (as described by LB and others) to restore it to its previous good natured and slightly humorous state, but bearing in mind that we are talking about "an average person", not an isolated person or person. If however, the degeneration is in mood where someone is trying to inject potentially abrasive and offensive material into a thread, attempting to destroy its good natured atmosphere, it is imperative that the mods act early and decisively. Whilst unsure which of these scenarios applies in this case and whilst questioning whether it was necessary to delete the whole thread, I certainly do not condemn the mods because it's a job
where you're damned if you do and damned if you don't.
Shall now grab and wife and newly-exercised dog and retreat into my bomb shelter.