Explaining the "Joker" Obama Poster

"patriots4u", posting at nj.com seems to explain it well :

It seems interesting to me to portray the POTUS as someone who used the people in the society not only to gain a pile of money just to destroy it, but also to pit one class of society against another in the hopes that they destroy each other. (The two boats equipped with a button to blow the other up is just one example)

We can only hope that like in the ending of the movie, we can all find it within ourselves to make the moral decision and not destroy others for the sake of saving ourselves.

Sound familiar? It should.