In order to understand what compels Jesus, you must keep in mind the distinction between the laws of God and the laws of men, and furthermore, that magnificent difference between the spirit of the law and the letter of the law.
Jesus sets before us a deeper, truer view of holiness. The issues are first and foremost internal, before they are ever external. You can murder someone without ever pulling a trigger. You break the Sabbath if come Sunday night you’re exhausted. Especially if you’ve been exhausted by church. Letter, and spirit. All those external “rules of men” do nothing to promote a genuine holiness. But they do make people Pharisees. By the truckload.