In today's edition, Motley Fool analyst Brendan Byrnes takes a look at the reasons why one might want to sell one's shares of Ford (NYSE: F). Brendan is a Ford shareholder and remains bullish on the company, but he describes why it's a useful exercise to play devil's advocate to find reasons you might want to sell stocks in your portfolio. For Ford, one big reason is Europe. The company will lose at least $1.5 billion on the continent this year, with around the same loss projected for next year. Another reason that investors might want to sell the stock is the fact that the company is playing catch-up in the world's biggest auto market, China. Check out the video below for more reasons that one might want to sell Ford, and Brendan's conclusion on why he remains confident in the stock.