"That is, at some point, having walked down the tunnel for quite some time, the rational thing would appear to be to turn back. Why would someone not turn back?

"That is, at some point, having walked down the tunnel for quite some time, the rational thing would appear to be to turn back. Why would someone not turn back?" Sunk cost fallacy: http://en.wikipedia.org/wiki/Sunk_costs#Loss_aversion_and_the_sunk_cost_fallacy http://en.wikipedia.org/wiki/Sunk_costs#Loss_aversion_and_th...