I was replacing outlets in the basement and noticed that unfinished basements require them to be GFCI protected. While I did do this, I can't help but wonder: WHY?? I searched for the NEC definition of "unfinished basement" and I just don't see why the fact it's not "habitable" it needs GFCI. I can understand moisture areas like outlets near sinks, etc., but not this: my basement is very dry and whether the basement is finished or not does not affect the moisture content. Does the NEC explain this?