I think there absolutely would be enough if they also covered international stories as well as happier news. There's a whole lot more good going on in the world right now than bad, but for some reason we do not highlight it.
Once you get a taste of "bad" it dominates.
I have no clue how you could ever even estimate this sort of ratio. How do you even quantify the "number of things going on", let alone confidently split them into good and bad?
Mentally you tend to equally weigh both good and bad news over a long time span, but negative news gets a much quicker and stronger initial reaction, thus it gets priority. Just an evolutionary trait, don't wait to see if the shadow is a tiger just assume it is about to attack.
This is why social media ends up the way it is, that quick reaction is what the algorithms pick up on even if long term it isn't any different. It is a hard issue to overcome especially when it is a free market race to the bottom.