When it comes to their investments, people should vote their pocketbooks and save their conscience for the ballot box or the checkout line. We invest our hard-earned savings to maximize our wealth, and in the U.S. today, wealth is power and freedom. In fact, the U.S. Supreme Court has said that money is protected political speech under the Constitution, so if you have a social conscience, you'll be much more successful in furthering your agenda if you have more money with which to support your views.
If people with a social conscience put strict limits on their investment strategy in order to maintain social purity in their portfolio, their portfolios will suffer and their ability to support their views will too. At the same time, those with an opposing viewpoint are bound to prosper and get their way.
At the time of publication the author held shares of AAPL.