negativity bias is actually a caveman-evolved thing is something I was told.

I was told that when people remembered a negative experience again and again and again and again back in the caveman days it made it easier to avoid that negative experience. So The cavemen and women that remembered that 'THIS is the plant that killed Krooga ’ or rembered ‘Oh we cant go over there cause that place is full of cliffs and cave-cover-collapse sinkholes’ or ‘damn, that cougar looks kinda biiig. JUST as big as the cougar that killed my girlfriend/dad/whoever. Guess we wont hunt it. We’ll hunt something smaller’ tended to be the ones who lived and reproduced the most often since they were the ones who typically avoided lethal dangers the most.

Negativity bias isnt a completely bad thing…uhh in some cases. Its a becomes good thing whene it helps to prevent you from getting back into experiences that can lead to your pain or greivous wounds again. It becoems self-destructive when you start to see it as a reason to just do nothing at all, even things that could help you.