As president of the USA, Obama is responsible for the decisions that he makes. And probably many that he does not make.
A new coach of a sports team may be given a pass initially, but at some time the team becomes his baby and he will usually be fired if he does not produce.
And here is my opinion, there is not one person who can be blamed for all the ills of my town, my country, my state, my country, or the world in which I live. And if you happen to find out that I am wrong and learn this person's identity, please let me know. I would love to express my opinion to him (third person singular, neuter ).
Jay