Procrastination, escapism, a dash of stupidity, mingled with what must be a touch of OCD. To elucidate:
Procrastination - If I'm pontificating on REALLY IMPORTANT TOPICS
I'm not doing what I should be doing but somehow I don't feel as guilty as if I were off playing Mario Kart. Why I should feel that way I have no idea, but for some unfortunate reason I do. Neither is going to find me a job, balance my checkbook or do the laundry.
Escapism - Holding forth on topics that are either ultimately unanswerable, more a matter of opinion than of fact, or responding to the sort of thing that gets my undies in a twist, takes me out of my otherwise desolate life and briefly gives me the illusion that I actually matter. I know it is utterly untrue, but I do it anyways.
Stupidity - I argue like I might actually change someone's opinion about something. However, I can't think of any beliefs I've changed or modified from reading anything I've ever read on this or any other message board regarding the "Life, the Universe and Everything" topics. Nor can I think of ever modifying anyone else's opinion on any topic whatsoever.
In fact, come to think of it, I can't think of anyone ever posting that they used to believe "X" but now believe "Y" based at least in part on what they've read on a message board, at least re: the aforementioned "Life, the Universe and Everything" topics. Doubtless people have, I've just never come across it. I can't imagine it is all that common, some sort of percent of a percent akin to hitting the lottery.
So I proceed with behavior I've concluded is empirically false, barring what must be the rarest of exceptions, and yet for no rational reason stubbornly cling to. Sure sounds like stupidity to me.
OCD - Sometimes I see a thread title in the recent posts list, and I just gotta, gotta read it. Or see a new post in a thread I had sworn never to go near again, but do. I just gotta. And on this site 99% of the time that thread is in PPR.
(Hmmm.....this post itself probably doesn't satisfy all four conditions, but it certainly meets two, probably three of them. Here I go again.
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"The man who has fed the chicken every day throughout its life at last wrings its neck instead, showing that more refined views as to the uniformity of nature would have been useful to the chicken." ? Bertrand Russell