It makes sense that the ability to express your emotions improves the quality of the interaction you have with those around you. If a cat purrs those around it know it's feeling good, which can be useful information for future interaction.
I'm sure there have been cats who had a worse life because they didn't bond as well because they didn't purr, and consequently had a slightly lesser tendency to have their DNA end up in the next generation.
This argument goes for every ability to express emotions.
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