Bad memories are usually correlated with bad emotions (fear, anger) and there is some evidence pointing to the fact that we “feel” bad emotions much more deeply than good emotions (joy, happiness), because they have a bigger adaptive role from an evolutionary perspective (fear saves you from danger, anger motivates you to fix an injustice and so on), whereas the adaptive role of good emotions is less immediate and thought to be mostly limited to having a break from bad emotions. In other words, remembering bad experiences improves our survival, it allows us to learn from them so in the future we can avoid performing actions leading to them.
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