Why have an Army or Police Force?
It takes time and effort to manipulate a country.
Every year, when the Almanac pops up, I cycle through all of my army and check their happiness, respect etc. - and if it appears too low, and there is the chance they could join a coup, they are removed. Either fired, if there is no imminent threat; or imprisoned and starved in the Dungeon if a coup appears on the horizon. [He also prescreens army members to try to ensure that they have the highest courage and lowest leadership possible. Unfortunately, he says less about trying to manipulate their faction support.]
I also check the happiness index and look at the most unhappy 20 [entire population] and see if they look like they are causing trouble, or may do in the future. Often they have terrible respect and happiness, so I'll write them off as a bad investment and ensure they do not cause any more trouble, by either dropping them in the Dungeon or arresting them, then eliminate via nearby Guard post.
Should the person have some kind of education I will give them a few chances to find alternative employment that suits, this normally make them happier, as would be expected.
Then I check out all faction leaders each year and, if one looks upon me unfavourably (when I think they should at least be satisfied!) I'll make sure they 'resign' and can often find the replacement is more to my liking. In fact changing faction leaders happens often on my islands. I soften waves of arrests with Mardi Gras, etc. [Unfortunately, he doesn't mention bribes or why he doesn't use them.]
After that it is the common peon and I really don't worry too much about them, unless they are protesting constantly. Then they will be arrested and be given a swift ticket from the land of the living, by the Soldiers.
It is all a kind of Stalinist series of 5-Year Plans, but of a Capitalist vein. If they protest (or even look like they might protest, they are a threat!) then it is better for the rest of my loyal peons to have the enemy dealt with.
Oh, as an added note, guess what my favourite building is? No, not an Army Base, or Guard Post, but the Immigration Office. Yup, those girls sure make up for the tyranny and poor wages, hence their high pay.
Mr.P has practice in almost all aspects of oppression. Sometimes he is a bit heavy handed when one wishes he would be a bit more manipulative than so direct.
The Prison has a maximum term of seven years. The "Pardon" system is the same as eviction - SHIFT-Click on the prisoner to be pardoned.
The PI addition of the Dungeon is useful. Now that you have prisoners on imitation gruel, I suspect that the boys will not get much time on the target range. Let's just say I have not seen a single person get out of there alive.
Quiet starvation out of sight. Even regular gruel shortens life.