Anger is an expected response after some traumas / disasters - ask any EMT/Paramedic. Throw in tropical heat, lack of food, water, assistance, living outdoors, masses of injured children and others, the death of family and friends, the stench of death everywhere, the sense that you and everyone around you are nearing death yourselves, really exceptional circumstances - why not be angry and irrational even at the first ambulance crews arriving to help out. Responders should anticipate anger, and not dismiss it, but look to their safety too. Anger is seldom a permanent response to trauma, not if the aid is consistent and begins to overcome the disaster effects.