I think it's funny how there are so many complaints about "beating a dead horse", or "re-opening a can of worms" on these types of threads. Forums are a place for communication and discussion... In any public arena, whether in or out of the net, issues get brought to surface repeatedly, it's how we are!
While discussing things at work or with friends (that may be highly opinionated or inflammatory) do we limit ourselves to discussing it once in our lives? While at the water cooler do we tell our friends and colleagues to Google the debate because we've already "beat that dead horse"? I'm sure that happens, but I'd wager a majority of people are willing to re-hash old questions and dilemmas, it's very common and acceptable (IMHO)... perhaps human nature? It can sometimes bring out new viewpoints/ideas, it can serve to clarify points and issues, or it can turn into an utter pile of crap. That's the beauty of discussion with different people. If you don't want to get involved in the new can of worms, I would perhaps suggest to not jump into the open can yourself.
Just my .02 cents.