He wanted this oil spill to reach catastrophic proportions to demonize big oil to the vast majority of Americans. This gives him the moral high ground as he "puts his boot on the neck" of yet another sector of the American economy. His foreign policy has worked to the benefit of just those countries and movements praised by Howard Zinn and Noam Chomsky.
The anger the left has with him is just that he hasn't moved boldly or quickly enough.
I believe you are correct.