I don't see the problem. Either all sin is forgivable or none of it is. Repentance is not just apologizing. Repentance is "go and sin no more". If someone legitimately has a change of heart, God can forgive them just as He forgives you.

Saying "My sins are forgivable because I like doing them but other people's sins are despicable" is arrogant. God said He forgives all sins through true repentance.

That having been said, God calls us to uphold law and order on earth and punishing crimes. You sin against children and Jesus Himself calls for you to be cast in the ocean with a millstone tied to your neck. Forgiveness doesn't alleviate you from consequences.