I suppose you are correct; I was in a foul mood yesterday and I apologize for being less than tactful.
That said, I still don't feel guilt over Frostnova's fate, and images like these do nothing to alleviate that. She chose to do what she did.
Who said anything about guilt? It's called sympathy. People are upset about her death because they understand the circumstances that drove her to make the choices she did, and wish it could've turned out differently. If she had won, it would have proven her right, and if she hadn't given everything she had then it would've been meaningless.