because they devolve in to arguing over whose opinion is bigger, go way off from any relevance to the activity, we start getting multiple reports of violations, and closing the thread is more appropriate than trying to edit or remove posts. we have tried to be lenient on discussions lately, probably too lenient - it is a difficult balancing act.
I have encouraged people to open new threads after a brief reboot. please feel free to do so as long as they are appropriate. I'll close this thread as the question has been answered, and is also not appropriate per the guidelines.