We can't emotionally morn for people who we have no connection too. We can just not like it as an academic point.
While Actors and Actresses aren't any more deserving for life then the children of the "third world", their work as affected our lives, thus we have more of an emotional bond to them.
"No man is an island,
Entire of itself.
Each is a piece of the continent,
A part of the main.
If a clod be washed away by the sea,
Europe is the less.
As well as if a promontory were.
As well as if a manor of thine own
Or of thine friend's were.
Each man's death diminishes me,
For I am involved in mankind.
Therefore, send not to know
For whom the bell tolls,
It tolls for thee."
- John Donne