Bubbles on the Brain, noticed by Gabe Ivan
Marc Andreessen writes of permabears:
The human psyche seems to have a powerful underlying need to predict doom and gloom. I suspect this need was evolved into us way back when. If there is a nonzero chance that a giant man-eating saber-tooth tiger is going to come over the nearest hill and chomp you, then it's in your evolutionary best interest to predict doom and gloom more frequently than it actually happens.