[Bartweiss]

Hm, lots of options going - negativity bias (bad stuff is more memorable), conservatism bias (low-frequency events are overestimated), availability heuristic (memorable events like misrepresentations are overstated).

Honestly though, I'm not sure I'd call it a bias in your observation so much as a sensible assessment of sources. A source that's right about 90% of topics is still misleading you quite often. And even worse, a source that's 90% accurate about each topic can leave you almost totally ignorant; there are a lot of stories where the entire message can be destroyed by any one of numerous errors.

(And of course, there's a pithy name for that too. "O-ring theory", after the Challenger shuttle disaster, describes phenomena where everything has to go right, so the failure chance at each step is multiplicative.)