Are you using "playing the feel good game" to mean "initiate sex". If so, why? If not, then your response does not address "How is claiming that a 4 year old initiated the sex not an attempt to mitigate the responsibility?"
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Such a fact does not alter the responsibility, yet there is a reason for bringing up the fact, but there can be multiple reasons, so making such a claim need not be any one particular reason.
She started it so it wasn't just me so I'm only partially responsible and not fully responsible. (Victim blaming)
She started it, mr. attorney, to answer your question, sir. (Espousing facts)
She started it (and liked it) and I don't blame her at all and take full responsibility, but I bring it up because I think it should garner some leniency when it comes to sentencing, for it's far more egregious and deserving of a greater sentence if she cried and fought back and irrepraredly scarred her emotionally. I might not be right, and I suspect as much, but I bring it up for a reason, and that reason should not be interpreted to blame the victim. (Alternate reason for making the claim)