[G. Stepp: The short answer is "No." I hate headlines like this because it's not really a matter of "too" or "not enough." Judging from the levels of anxiety and depression in Western societies, most people could probably stand to use their capacity for positive bias to greater effect. Negative bias contributes greatly to depression and anxiety. But there is a trick to knowing when to curb which biases, and finding it begins with "metacognition," a fancy word for "thinking about how you're thinking."]
We humans are a hopeful bunch — so hopeful, in fact, that our views of the future are often irrationally positive. But at what point does unflagging optimism become detrimental to our progress and success?