Of course that doesn't mean that they never will but at least the odds are with you. You really want to avoid jumping in and out of a mutual fund. Most socially responsible investors are conservative in nature and practice a long term buy and hold plan. You are paying for professional management so it is worthwhile to learn about the manager running the fund. A fund manager is responsible for analyzing and choosing investment vehicles and deciding when an investment should be bought or sold.
Most funds have one fund manager but some firms employ a team of managers to run a fund.
Every team has a leader and your focus should be on the leader of the team. In general, a fund manager becomes more critical to the fund the broader the fund objectives. A narrow based fund, such as a sector fund, will only purchase investments within a particular industry and how well the fund does becomes more dependent upon how well that particular sector is performing as opposed to the expertise of the manager. Determine the expenses of the fund and if there is a sales load. The higher the expenses and loads the less money for you.