Do you think that unlike humans, they actually know the meaning of their existence?
Obviously there's now way for us to know, so I'm not looking for facts, just opinions. I myself don't really have one, this is something that I was randomly thinking about while I was half awake this morning.
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I can't imagine that they would. That would imply that as a sentient being with free will it is possible for us to have a purpose. It's hard to assume that we both have (truly) free will and that we also have a determined purpose in the universe. Same for any (assumed to be humanoid) alien creatures.