Not sure if this is a bias or not, but "magical thinking" -- the mode of thinking that implicitly ascribes a hidden 'essence' to events or objects. Different manifestations of this are: karma, homeopathy, "handmade is better than factory made", and so on.
I realize this question is contrived, but I figure it might provoke some fun discussion, so here goes:
If you could push a button and have your brain modified to precisely remove a cognitive bias (and have no other unnecessary effects—most convenient possible world), which would you choose? Why?
What if you were choosing for the whole human race?