One of the main reproachs democratic people addressed to the king was that, not his justice was arbitrary but he was out of its reach. The king's law couldnt affect the king the same way it affected the others.

Of course one could notice that bringing the democratic us before the democratic court of justice is exactly the same case with the same expected result.
So apparently democracy has the same limit as the king.
The king, as an originator of his law, couldnt trial himself on the same basis as the others.
A democratic people, as the originator of its law, cant trial itself on the same basis as the others.