Board Thread:Spoilers!/@comment-188360-20140512144616/@comment-3015137-20140607161204

I think that Elsa's powers were really beyond her own control which was why she was sealed away in the first place. She doesn't actually try to cause harm but her presence alone is enough to set off winter. Her powers would also act to protect her should someone try to cause her harm which is why she was sealed away, not because she was evil, but because her powers were too unstable (though I'd wager her imprisonment wasn't voluntary).