You're arguing with an idiot. He has already made up his mind, and doesn't mind being wrong. Any further involvement by you is a waste of time.
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Tell him 100% of male serial rapists utilized a penis. Ask him when he is going to turn his in.
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Heck, he's already turned in his brain. What's one body part more? We're much safer with these dangerous things like brains, penises, and guns only in the hands of the authorities.
FWIW, my ultimate argument for RKBA is that I do not trust the government to be the sole bearer of arms. In the 20th century, governments outright murdered 150 million of their own citizens. The activities of criminals pale in comparison.