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.
04/15 - Protest the Hero
05/06 - Misery Index
07/19 - Rise Against/Killswitch Engage
08/08 - Slipknot/Lamb of God