I wouldn’t say that a traffic accident without any casualties or injured which only causes commuter delays is “way more important” that a mass shooting where potentially there could be tens of victims no?

Also, still with the effect that you mention it seems like a minor-mid level news that, again, it probably doesn’t even affect the whole country. I still don’t see it as something that should be in worldnews. I'm open to input though I'm the first to accept that i am not the most knowledgeable about american stuff.