Aw gee, Kane wasn't so bad.
Kane: "He's your son. I couldn't do it."
Helen: "I know." She knows? What does she know? She doesn't know anything!
So Kane couldn't bring himself to kill Phil (alliteration!) in cold blood. What a nice guy! He really does have a kind heart! Never mind the facts that he murdered two innocent teenagers, an innocent, pathetic drug-addict mother, boinked an underage girl and murdered her in cold blood when she became "a loose end".
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You have meddled with the primal forces of nature, and YOU ... WILL ... ATONE!