Romans 13:1–7

13 Let every person be subject to the governing authorities. For there is no authority except from God, and those that exist have been instituted by God. 2 Therefore whoever resists the authorities resists what God has appointed, and those who resist will incur judgment. 3 For
rulers are not a terror to good conduct, but to bad. Would you have no
fear of the one who is in authority? Then do what is good, and you will receive his approval, 4 for she
is God’s servant for your good. But if you do wrong, be afraid, for he
does not bear the sword in vain. For he is the servant of God, tan avenger who carries out God’s wrath on the wrongdoer. 5 Therefore one must be in subjection, not only to avoid God’s wrath but also for the sake of conscience. 6 For because of this you also pay taxes, for the authorities are ministers of God, attending to this very thing. 7 Pay
to all what is owed to them: taxes to whom taxes are owed, revenue to
whom revenue is owed, respect to whom respect is owed, honor to whom
honor is owed.

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Is rape and assault illegal in your country? If so you should be compelled to hand him over to the governmental authorities. There are consequences in place to not only punish people, but to bring people to change their attitudes and behaviors to avoid future repeat offenses and sins.