Because the activists usually cash out their holdings shortly after their demands are accepted or rejected, the question remains whether most of them are committed to companies' future success. The risk is significant that their initiatives can weaken a company's competitive position, to the detriment of long-term shareholders, and the high-leverage financing structures they often propose may put companies in jeopardy in the event of an economic downturn.
Bill George and Jay W. Lorsch, "How to Outsmart Activist Investors," in: Harvard Business Review, May 2014.