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People are inherently pessimistic and this isn't actually the fault of the media (although the Daily Mail etc. do a pretty good job).
Citation needed: Paul Rozin and Edward Royzman showed that a negative perspective is more contagous than a positive one: http://journals.sagepub.com/doi/pdf/10.1207/S15327957PSPR0504_2
Also John Cacioppo et al showed that our attitudes are more heavily influenced by bad news than good news:
http://journals.sagepub.com/doi/abs/10.1207/s15327957pspr0101_2
This is interesting (and was on the radio this morning)
https://www.ipsos.com/ipsos-mori/en-uk/perils-perception-2017
Why does it happen? Step forward The Daily Mail etc.