I can think of a few reasons:
1. Many of the structures in places are perceived as failing, even though in absolute terms they are not obviously doing worse than previous times.
2. There is a rise in nationalist sentiment and a semi-cosmopolitan ethic is starting to lose influence.
3. The chance of violent conflict is rising.
4. Dialogue is becoming more polarized and bigoted, and at some margins stupider.
5. Tales of gruesome torture are being spread by new publishing and communications media.
6. The world may nonetheless end up much better off, but the ride to get there will be rocky iindeed.
I have been reading Carlos M.N. Eire, Reformations: The Early Modern World, 1450-1650. Yes I know it is 893 pp., but it is actually one of the most readable books I have had in my hands all year.