These people did these things not because they are Christian, but because they are morons. Because one can assume 30% of humans are morons, at times like these, 30% of the people in groups are morons. 70% of the population are Christians. Therefore, in any given sample, 70% of the 30% of the group are going to be Christian morons. And because Christianity appeals by design appeals to non-thinkers, the numbers might be slightly skewed on the side of the morons. I am a thinking Christian. I would not have done what you described here because i am not a moron. Don't confuse religious people with morons. I know it's not always easy, but in any group, you'll get those 30% who give th rest of the group a bad name only because they are idiots. Don't paint the whole group with that same brush.  
I was overwhelmed by the non racial, non credist, non classist outpouring of love from all parts of the country to help those affected by this dreadful disaster.