Evolution doesn't create anything for any reason. It means that mutations were created along the way. If the mutations survive and pass it on to the next generation, then the mutation stays. It is survival of the fittest, not necessarily creation of the fittest. So just because humans survived with their emotions, don't mean they are a benefit.
Look at field mice. Their diminutive stature is definitely no benefit. But they learned to work with it, so they are still around.
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