Mindfire
Istar
Like I said, it's definitional. So the answer to your question of "how is it not evil" is that not everyone adopts your viewpoint and definition of it
It wouldn't call it definitional so much as semantic. I think the same word is being attached to very different concepts. No one here thinks that sexual attraction is inherently bad (the definition you're using), but I think everyone would agree that sexual attraction that in practice demeans or abuses someone else (the definition I'm using) is definitely a bad thing. What you are calling lust, I would call libido. What I am calling lust, honestly I'm not sure what other word you can use for it.