By Svea Herbst-Bayliss and Greg Roumeliotis (Reuters) -Tiny activist investor Bluebell Capital Partners is taking aim at BlackRock, the world’s largest asset manager, blasting its focus on environmental, social and corporate governance (ESG) issues and seeking to oust longtime CEO Larry Fink who advises captains of industry and world leaders. Bluebell, with roughly $250 million in assets, is criticizing BlackRock, which invests over $10 trillion, for its stance on ESG, saying BlackRock “has lost sight with its mission as an investment manager” while taking the “self-appointed right to share th…