It is certainly not for altruistic purposes. Although he does have a point about the fact that energetic independence would boost American security by avoiding trade with brutal, dictatorial regimes as Islamic Saudi Arabia, Iran or other totalitarian regimes which provides them with funds; Pickens is mainly interested in furthering his own interests with regards to his own economic stakes in the fracking industry of shale gas and oil.
He also wants demand of oil and other fossile fuels to be reduced so thattheir prices go up, increasing his profit margins exponentially. He definitely does not care about the deleterious effects of fracking on the environment.