Notes on specific laws - the Third Law
As the level of civility approaches absolute zero, the uselessness of an exchange of posts approaches infinity.
There are many threads which are started in good humour - seeking information, looking for an intelligent discussion, or passing on a humorous tidbit. Most of them carry on in the same vein, but, occasionally, people get carried away. Discussion becomes argument, argument becomes name-calling. Tempers fray, feelings get hurt, reputations damaged. We've all seen it, or even been there.
Eventually, when a thread begins to descend into the mire, it actually swamps all the original good it might have done.
Such a thread must be walked away from. Wash your hands of a troll before you get dragged too deep. Abandon it to the fate of the the Second Law, before you waste too much precious bandwidth.