The Increasing Trivialization of September 11

This is sad: "9/11 Families Upset Over Tourists' Treatment of Memorial: Report". Do people act this way at the Vietnam Veterans Memorial Wall, or at Arlington Cemetery? I don't think so. I always thought September 11 was a day to mourn and to remember the victims of  our worst terrorist attack, the way Memorial Day remembers those veterans who died protecting our country. And since when has it been trivialized into a day for volunteering?