Value Drift

The effective altruists have a concept called "value drift". The idea is that passionate people over time lose their passion and stop being altruists. It is valuable to add a person to an altruistic movement, but also perhaps equally valuable to keep a person from leaving one.

Drift is something that you don't always understand at the time. Some people might decisively quit altruistic pursuits, but the danger is more that you will go lukewarm and then cold over time, sinking into the default without catching yourself.