"For some reason" is that people do not watch it.

Once you get a taste of "bad" it dominates.

It's important to remember that actually reporting news is a tertiary purpose of the news business. The primary purpose is to sell advertising. The secondary purpose is to get eyeballs onto their product, in order to facilitate the primary purpose. Reporting news is only done because it's how they've chosen to get those eyeballs.

Maybe for some people, but I see no reason we shouldn't seek out and show good news... I think it makes people happier.