Several reasons for a news blackout. Some are, the media gets in the way, they use resources that are better spent on rescue efforts and on those who already live there, and they go into areas that are still unsafe and may require rescue themselves.
They also magnify certain situations causing relief efforts to be ruled by emotion and not planning.
All of what you listed is true, but I also think it is out of consideration for the families. I know I would not want to be watching TV and see a loved one in a mangled heap among the debris piles. If that is the case, I think it is honorable, and folks just need to have patience.