Family courts actively oppose contract law. If they don't like a prenup they will simply throw it out. Signing and swearing oaths means nothing to them. Actively anti-property. Full communism.
Marriage is a contract, and that contract has been criminalized. Family courts offer "remedies" to women only otherwise available in criminal trials. De jure, marriage is a crime men commit upon women. Bonus round: there is no statute of limitations on this crime.