A Yid Can Serve Only a King Who Has Submitted to Hashem
Shaul HaMelech was the chosen by Hashem. He was pure of any sin, and we have no inkling of the lofty levels that he attained. But when there was a matter in which he disregarded the wishes of Hashem, he was immediately told that he can no longer be king. Because a Melech Yisrael must be utterly and completely submitted to Hashem. Only then can he transmit and mirror the light of Hashem to the Jewish People!
If he isn’t sufficiently submissive, he cannot be king. For we know the rule that a Yid may only be a servant to Hashem, and not the subject of a servant. Thus, how can we serve a human being? Only if the king ליה לית כלום מגרמיה, has nothing of his own. He is merely a mirror, a clear window that brings the light of Hashem to the people. This is the definition of Malchus! This is true Malchus!
And with this yesod, we can understand that while the Melech Yisrael may seem to be haughty and mighty, his sole claim to dominion over his Jewish subjects is the fact that he is completely nullified to the Ribbono shel Olam. This is the true understanding of Middas HaMalchus.
True Malchus Exists Only with Yiddishe Kinder
True kingship doesn’t exist for goyim—no matter how splendid a king may seem. They have the kelipah of Malchus. They have taken Malchus and made it an entity in itself—and therefore it has no benefit.
In today’s democratic world, we don’t have the concept of malchus in any case—but they never really had it. For true malchus that the Ribbono shel Olam created belongs to the Jewish People: It is solely a vessel to help us become submissive to the Ribbono shel Olam.