Wouldn’t all the problems with a monopoly be 100 times worse when done by the government? You remove any potential for competition, government officials would still act in their own self interests (as they always have and always will), the government maintains their power through military force, there are no laws or legislations to stop them, it’d control everything it possibly could, and any objections are met with legal punishment.

I’m no fan of monopolies, but a totalitarian government (which is what every government strives for) is much worse.