Rav Dimi traveled from the land of Israel to Babylonia: The Hasmonean court isn't decrees against a man sleeping with a non-Jewish woman that puts him in violation of 4 injunctions: a woman who is impure from menstruation (even if she's not Jewish, when that wouldn't usually apply), a non-Jewish maidservant, a non-Jewish woman, and a married woman. That last one was subject to debate, and "zonah," prostitute, was suggested in place of adultery. But a Jewish man who saw this kind of event and brings it to the attention of the court is NOT told by the court to take it forward. That is, the court does not approve of these matters being taken into the hands of individuals, by those individuals. Also, a read of Pinchas, the archetypal zealot. 6 miracles were done for Pinchas when he acted against Zimri and Cozbi. With graphic, fascinating interpretations with regard to each of these three (and their sin).