The reason is not that the media or the journalists do something wrong. Rather, the vast majority of the public is simply not interested in being educated or informed.
You can send the best art / math / business professor to a school, but if the students are not interested in that field and have no need for a good grade, there will be very little learning done.
The public is quite capable to take any information they are offered, and convert it to an argument in favor of their political or social beliefs; it is also very capable, when given a choice, to select the lowest quality information.
It's unclear to me how anything can be done to counteract those tendencies. And as long as these tendencies stay in place, it seems rather futile to discuss "better news".