Love cannot truly kill people, because love gives of it's self for another. When people say "I killed her because I loved her", it's not love, it's a perverted love that is in essence, pride, arrogance, jealousy, and especially fear. Can hate save them?? Hummm I've never heard someone say I hate you that's why I'm going to save you, unless they are saving you so that something worse can happen to you. Like don't die we haven't tortured you yet and we're so looking forward to it.
I can't think of any examples of helping someone you hate, maybe it could be for the better good, like a religious person not wanting you, their enemy, to die because they might fear your eternal punishment, and want to save you from that..But then that would be love.
Oh...I don't know...That is a good question..