In science fiction, why are aliens so human.?

Either they look.just like us or they look different (perhaps very different) but have very human like societies and very similar ways of life, laws, morals and so on. Yes there are times when an alien doesn't confirm to our understanding but for the most part, aliens who a very different from us tend to be... show more Either they look.just like us or they look different (perhaps very different) but have very human like societies and very similar ways of life, laws, morals and so on.

Yes there are times when an alien doesn't confirm to our understanding but for the most part, aliens who a very different from us tend to be portrayed as the baddies and must be exterminated for the good of all.

Why is this, why do we favour aliens being just like us?
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