It makes sense that Kore would be relunctant to leave the land of the living and the arms of her mother, Demeter. What doesn't make sense is that she would be held against her will or openly give up the opportunity to not only be Queen of the Underworld, but also the Shepherdess of Souls.
It's possible Kore might not have embaced her destiny wholeheartedly at first. Could she have been afraid to grow and to be transformed? Did she fear these things the way mortals naturally fear the transformation of death? Could she have fought these changes the way mortals fight to survive?
Eventually it is the love of Pluton that changes her; that makes her whole, and helps her to realize her true potential and destiny. I don't believe a divine being like that could be a rapist. So, why do you suppose this story became twisted? Is there some patriarchal reason as to why Kore would need to be forced into becoming Persephone?
In the Homeric Hymn to Demeter Persephone (Kore) is given away to Pluton/Hades by Zeus (sometimes her father and sometimes her uncle). This rings of patriarchal influences and hints that a woman couldn't possibly have the power to think for herself and make the decision to change her existence. In no way does this speak about what we know of Goddess societies and it can only be assumed that the myths including aspects of rape are a later retelling of a very ancient story.
I found the passage below at The Other Ivy's blog, Stone Circle. I immediately fell in love with it and it suddenly resonated inside me like something true. It wasn't the first time I had heard of an alternate, non-rape version of the story, but it was so inspiring that I had to post it here along with my musings.
...No one understands anymore
how beautiful he was. But Persephone remembers.
Also that he embraced her, right there,
with her uncle watching. She remembers
sunlight flashing on his bare arms.
This is the last moment she remembers clearly.
Then the dark god bore her away.
She also remembers, less clearly,
the chilling insight that from this moment
she couldn't live without him again.
The girl who disappears from the pool
will never return. A woman will return,
looking for the girl she was...
- Excerpt from"The Myth of Innocence"
from Averno by Louise Glück.