Answer:
They could not have live footage or footage at all, or images might be too cruel or harsh for television.
Explanation:
A story better suited for a reader could be some investigative journalism of things that happened in the past and we do not have footage of it, or for example threats to national security over letters, or things that are simply too cruel for television and we do not want to show those images. Bombings or other hard images can also be better shown in readers if you don't want to leave a hard impression on your audience.
