TLIK: One of the sheva Mitzvos is retzicha. As such, regulations of what constitutes retzicha and what does not and, rather, is self-defense, is part and parcel of the halachos goyim are subject to.
huju: Jews must respect and live by civil law only to the extent that it does not conflict with Halacha. When it does, it is very clear that Halacha takes precedence.