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Re:Why We Haven’t Met Any Aliens by d5tryr on Thursday December 22, 2011 @01:33AM (#3380654)
Agreed on it being a terrible article. Way too many 'clever' turns of phrase. Why make a statement when you can juxtapose some pop culture references? Seems much more of an act of self indulgence than the condemning of one...

But as for your list I think you left out the Occam's razor option:

5) Rare earth hypothesis

http://en.wikipedia.org/wiki/Rare_Earth_hypothesis

Re:Why We Haven’t Met Any Aliens by asdkl234890 on Thursday December 22, 2011 @01:37AM (#3380667)
Also space is really BIG, and no one can go faster than light.
Re:Why We Haven’t Met Any Aliens by d5tryr on Thursday December 22, 2011 @01:49AM (#3380689)
BIG space doesn't solve the exponentially-reproducing colonist issue though...
Re:Why We Haven’t Met Any Aliens by rbanffy on Thursday December 22, 2011 @07:25AM (#3381307)
Plus, if an exponentially-reproducing civilization appeared even in a neighboring galaxy a couple million years ago, we'd probably be able to notice something very strange.

If it appeared in this galaxy, we'd probably never have evolved.