The only people who like this movie are Jap wannabes
There is no deep japanese psychology working here, it's just a horrible movie that doesn't know what it wants to be.
Actually the OP is completely incorrect in his narrowminded summation. Casshern very poignantly explores many philosophical, spiritual, historical and political views, drawn from its homeland, Japan but also from the world.
But I guess that makes me a "Jap wannabe". Such a term could only come from an illeducated moron, however.