How is the radio station supposed to be at fault? Personal responsibility, people.
They were at fault by knowing that what they were doing was dangerous and reckless, and that people had died doing that sort of thing.
Kinda like if they had been playing Russian roulette and they were passing around revolvers with one chamber loaded. Except in this case, the participants (probably) didn't know they were gambling with their lives, and by their own public admission the radio station dudes did.
That's how.