According to this New York Times article one third of the people killed as a result of the earthquake/tsunamis were children. It is incomprehensible to me how so many people could be wiped out in a matter of moments, but it is so much worse to read about children.
Although I am not sure if it is any consolation, but how can you yell at the Earth. Nature is not given to acting maliciously because of a desire for oil, gems, or wealth of any sort. Nature acts and we are forced to deal with it.
As hard it must be, I would think that this is better than random acts of violence, but than again there is nothing that can really help explain the loss of a child.