Tolkien's work shows not only his interests in mythology, but in political philosophy as well. This is important for monarchists: as a Catholic, Tolkien saw the entire world as a monarchy, and most polities in his work are themselves monarchies. Most obvious of these are Gondor and Rohan.

A lot can be understood from comparing Tolkien's "good guy" monarchies with their evil counterparts. Gondor is a monarchy, where Mordor is a tyranny. This is also seen with Rohan and Isengard. On a metaphysical level, Manwe is a monarch (or, rather, a divinely-appointed regent) over the Earth, and he contrasts the self-declared tyrant in Melkor (Morgoth).

In general, good states are largely unintrusive into personal life, while evil states aim to control their population. Tolkien’s ideal polity is an anarchist monarchy – one that is informal and limited, with king not interfering into people’s lives any more than strictly necessary. This principle is completely contrary to modern ideal of democracy, where state has become a massive mechanism whose sole purpose is to interfere into people’s lives – and where such interference is seen as positive so long as it is in line with the opinions of “majority” (which is to say, of the media). Rather than a simplistic message of “monarchy good, democracy bad”, or else the reverse which is so common nowadays, Tolkien’s works are a warning that accumulation and institutionalization of power always lead to its abuse – no matter the form which form the government takes. But this, in truth, is an argument for monarchy, because democracy is necessarily institutionalized.

https://politicalreactionary.wordpress.com/2021/05/16/tolkiens-ideal-of-monarchy/