The news has always been "almost entirely negative", even when the only source was newspapers. But being informed of what's going on, vs being clueless; there's a societal benefit in having an informed citizenry.

This does presume that that half hour or hour is not a purely editorial function (think Walter Cronkite vs Tucker Carlson), and that the goal is to actually cover the news of the world, not create partisan wedges and glue eyeballs (again, same comparison). But even if it's negative, understanding what is going on matters, and is likely a net gain for society, with a minimal individual cost.

What isn't a net gain is being so consumed by world events (or worse, editorialized versions of world events) that you lose sight on your personal world, and are unable to enjoy the moments around you. A similar effect is at play with social media.