You're talking about people who lost their homes, all of their belongings, and loved ones.
Think about your entire life being rip from under you like a cheap rug.
With regards to 9/11, many of those children only have one parent now. These organizations are trying to make the kids live's as much like how they would have been if they didn't lose their parent.
I agree that the media over does it sometimes, but the organizations have a good cause in mind and ultimately, all you have to do is not participate for it not to affect you.
Personally, I'm looking for a place to donate for the fires here in CA. Last count I heard was that there were 8 and just under a million people have been evacuated. More than Katrina!