Not Practising What You Preach
It seems the Jews considered themselves exempt from judgement because they had the law. Paul agrees with them that their possession of the law is a wonderful thing. It is the mind of God. We too have a great privilege, possessing the word of God. However, he accuses them of hypocrisy. If you teach others to keep the law, what matters is that you keep the law. Christians should make their voice heard and campaign for standards they derive from Scripture. We have the right and responsibility to proclaim these standards.