Given the example in the NT those who committed fornication were the publicans that collected taxes for Rome. The people were to give to Ceasar what was Ceasar's, but those Jews collected over and above for there own gain. The people feared the Romans, paid taxes, thereby giving them their due, Romans 13:7 But the publicans that gave honor to God, as is His due, were highly commended. The case of Zacharia the publican shows him repaying all his illicit gain out of a contrite heart. Or the publican that beat his breast saying forgive me a sinner having been forgiven over the Pharisee that thought he did no wrong. The publican was forgiven, it doesn't say whether he went back to his old ways, but his attitude toward God was preferred over self-righteousness
Romans 13
1 Let everyone be subject to the governing authorities, for there is no authority except that which God has established. The authorities that exist have been established by God.
2 Consequently, whoever rebels against the authority is rebelling against what God has instituted, and those who do so will bring judgment on themselves.
3 For rulers hold no terror for those who do right, but for those who do wrong. Do you want to be free from fear of the one in authority? Then do what is right and you will be commended.
4 For the one in authority is God’s servant for your good. But if you do wrong, be afraid, for rulers do not bear the sword for no reason. They are God’s servants, agents of wrath to bring punishment on the wrongdoer.
5 Therefore, it is necessary to submit to the authorities, not only because of possible punishment but also as a matter of conscience.
6 This is also why you pay taxes, for the authorities are God’s servants, who give their full time to governing.
7 Give to everyone what you owe them: If you owe taxes, pay taxes; if revenue, then revenue; if respect, then respect; if honor, then honor.
The church's fornication is falling back to the old nature/old ways that are not of Christ as given in the example of in
Romans 7:1-3
Released From the Law, Bound to Christ
1 Do you not know, brothers and sisters—for I am speaking to those who know the law—that the law has authority over someone only as long as that person lives?
2 For example, by law a married woman is bound to her husband as long as he is alive, but if her husband dies, she is released from the law that binds her to him.
3 So then, if she has sexual relations with another man while her husband is still alive, she is called an adulteress. But if her husband dies, she is released from that law and is not an adulteress if she marries another man.