Focusing on an individual case like this essentially isolates it. Hundreds of thousands of people weren't at risk; Grandma was. There's an agenda at work here.
The media outlet in question is going to be more closely aligned to the power providers in Texas than they are to the victims.
ABC, NBC, et. al. let Fox take the heat for being right wing, while in reality they're all the same. It's just a question of subtlety.