It's hard to find people who think negativity is a good thing. But if negativity is bad, why is there so much of it? Why is it so popular? There's growing evidence that our interest in negativity isn't just a nasty habit created by media and politicians; it's part of the way our brains work.
Are you a pessimist or an optimist? When you've eaten all the whipped cream and upper midsection of your Venti Soy Mocha Frappuccino, is that cup half empty or is it half full of stuff you probably shouldn't be drinking at the start of your day?
If you want to know what goes on in your brain as you "think", and you can only read one of the flood of recent books on the subject, you can not do better than Daniel Kahneman's Thinking, Fast and Slow.
Pessimism can be bad for your health, and it could lead to heart disease and strokes. You may not be able turn to yourself into a whistling, wide-eyed optimist, but it is worth the effort to shed yourself of cynical hostility.