This type of decision making might simply be an evolutionarily-selected random seeding.
For example, when running an evolutionary algorithm, it is vital to have randomness seeded into the mix. This allows for the system or algorithm to escape from local maxima.
Douglas Adams had a great quote at the end of one of his last lectures regarding humans' re-invention of everything - nothing is ever 'good enough': http://www.guba.com/watch/3000053272
Perhaps this is all that just random, unpredictable outcomes from a horrendously complex system we call the brain, which has emerged out of a random, unpredictable and horrendously complex universe.