" when of equal intensity, things of a more negative nature have a greater effect on one's psychological state and processes than neutral or positive things." -https://en.wikipedia.org/wiki/Negativity_bias

"Research indicates that at the subconscious level, the mind tends to focus on the optimistic; while at the conscious level, it tends to focus on the negative." - https://en.wikipedia.org/wiki/Pollyanna_principle