By that criterion, we shouldn't talk about a murder in our neighborhood, about our children failing at maths, about unemployment... War is worse than all these.
Also, it's not news when every headline every day is "more 150 people dead in war". You think people would keep watching the news, let alone caring about some war far, far away?
American "news" seems to find a reason to talk every hour about the plane mass-murder, many times just saying "we have nothing new to tell you" even the reporters they turn to simply repeat in different words what the anchor JUST SAID.
So why not cover all the countries currently at war in the middle east every hour. They most definitely have news every hour on that one because more people have died. No more people are going to die in that single plane crash despite hundreds of hours of coverage.