Right now, I can cut the world some slack because I don't think even most Americans comprehend what is happening. Right now, they think it's a strong hurricane and a bad flooding problem. They don't understand that this is a disaster of biblical proportions.
The concept of the entire coastline of a state being obliterated is too much for people to comprehend all at once, much less the complete ruin of a major American city in an adjacent state with the concomitant deaths. If I weren't watching it unfold, I would hardly believe it.
People get numb to the pictures. The Mississippi River flooded suburban St. Louis in 1992, and Allison flooded Houston in 2001. It was bad, there were shocking pictures, people lost homes, rebuilt, moved on. In 2004, hurricanes hit Florida, things got smashed, some people died, everyone is rebuilding, moving on.
I don't think a lot of people understand yet that this is different, very, very different. It's going to take a while to sink in.