I can understand the complaining about changing up a setlist from say, one North American tour to another North American tour, but why the complaining about changing up the setlist from a North American tour to a European tour? The Irish fans were, i'm assuming, not at any of the small string of NA dates they did in January.
10/06 - The Black Dahlia Murder
11/30 - Slipknot/Korn
12/27 - Protest the Hero