You're completely ignoring the most important data. Han Solo and Darth Vader are not the same person. Maybe one is just more likable than the other?

You can have two different comedians tell identical jokes, word for word, and only one of them will be funny. Jim Jefferies does an entire bit about a journalist who reviews his jokes harshly after transcribing them to text. His conclusion is (paraphrasing) "my entire job is to say offensive things while still being likable."