I just signed up to IMDb simply to express my delight in how refreshing this film was. It is an exploration of how groups are marginalised by society, and labelled with negative connotations, causing not only fringe group extremists but self fulfilling prophecies.
John represents the world view of the Zombie group, and as the film progress you can see how this world view is pushing the zombies away from integration, into the fringe of society and into the arms of angry primarily labelled and conforming leaders who's angry voices are the only ones to be heard at such an extremes of social exclusion.
People have said that the movement of the Zombies at the end, into the expected "typical" behaviour of that group ruins the film, and any sympathy for them dies with it. It in fact shows how having pre-conditioned ideas of how a people behave actually creates a self fulfilling prophecy.
Excellent film. Bravo.