Quote from LoveOfProfit:
"Conversely people strongly prefer risks that might possibly mitigate a loss (called risk seeking behavior)."
Not cutting your losses is exposing yourself to more risk, because they prefer to take the chance that the stock will turn around than to cut their losses.
It's this very risk seeking behavior which stems from loss aversion that explains why many people can't accept a loss.
If you still don't understand,
Quote from LoveOfProfit:
I don't think he does. Clearly Wikipedia is already more than a match for his reading comprehension skills.