You're welcome to go over there and tell them to stop it. They usually have a lot of power and resources, and they're unwilling to give it up.
As an American, I don't want to see my fellow countrymen dying in another pointless war, so my view is that we should generally mind our own business.
I've spoken with someone who claimed to be a monarchy proponent and they suggested I read: "Democracy – The God That Failed: The Economics and Politics of Monarchy, Democracy and Natural Order (Perspectives on Democratic Practice)", by Hans-Hermann Hoppe. I don't know anything about the author, nor have I read the book, but perhaps that might help provide some insight into why some support a monarchy.
I suggest you do look up the author, because he is rather infamous for saying and writing stuff like this:
"In a covenant concluded among proprietor and community tenants for the purpose of protecting their private property, no such thing as a right to free (unlimited) speech exists, not even to unlimited speech on one's own tenant-property. One may say innumerable things and promote almost any idea under the sun, but naturally no one is permitted to advocate ideas contrary to the very purpose of the covenant of preserving and protecting private property, such as democracy and communism. There can be no tolerance toward democrats and communists in a libertarian social order. They will have to be physically separated and expelled from society. Likewise, in a covenant founded for the purpose of protecting family and kin, there can be no tolerance toward those habitually promoting lifestyles incompatible with this goal. They – the advocates of alternative, non-family and kin-centered lifestyles such as, for instance, individual hedonism, parasitism, nature-environment worship, homosexuality, or communism – will have to be physically removed from society, too, if one is to maintain a libertarian order."
(Yes, the man seriously calls himself a libertarian.)
The book “The Dictator’s Handbook: Why Bad Behavior is almost always Good Politics” explains this fairly well. It’s a great read, maybe a bit depressing.
TLDR: it’s cheaper to pay off a small group (family) rather than a big group (populace).
That is by far the best book I’ve read about politics. It starts with a simple premise and is able to explain a lot. This video gives the short version - https://youtu.be/rStL7niR7gs
