And pray tell, who comes up with common law? And who enforces the judgment of the court? And what gives the court the authority to judge on the matter of glass shards in your tomato paste?

Fun fact about the common law in fact is that it came into existence because the English government after the Norman conquest needed a unified theory of law for the king's courts that was distinct from manorial and canon laws. 1154 Henry 2 the Plantagenet ascended the throne and wanted a code of law that would apply everywhere in the realm as opposed to local laws, the aforementioned manorial laws, as well as being secular, unlike canon law.

So without the government, you wouldn't have this common law your legal theory relies on.