Headlines will change return expectations and cause investors to switch their views on the chance of markets being in a good or bad state. This will lead to greater deviations in prices. An increase in volatility will mean that return premium have to increase to compensate investors for the added risk from uncertainty. The short-term impact between risk and return can be complex, but longer-term links between news implied volatility and return is actually well-defined.
This link is especially the case when the news is focused on low probability potential disasters. There has been strong research work that when the probability of a rare disaster or left-hand tail event increases, returns will have to also increase to compensate for risk. Rare disaster risk has been used as an explanation for the excess return premium in equities.