A government must have selling points that keep people buying it. One thing all governments do is to make people believe that the government is doing the right thing, that they are being protected by the government from other governments that are not as good as the government that is currantly in control of a particular piece of land. They need some way to enforce their control, so make armies, police forces, and judical systems to see to it that any who don't follow the laws of the government while in the land area that has been controlled by the police forces, and armies of that government.
One way to make it easier for a government to keep control, is propaganda, when a government needs to use thier police force too much, then people start to question the government and is a sure indicator that the people are not doing what the government say they must do. The more they rely on strong arm tactics to enforce thier control, the more oppresive they become to the people, and the more likely they will be replaced by another governmen that has better selling points then they do. So in order to have a least costly government, and more control over the people, a government must not appear oppressive, and instead made to look benifical and very necessary, they need to provide some services that are considered good and benifical to the people live on that land, so that the people will l keep buying them and not some other brand. In order to keep the people controlled and pacified,, propaganda is a very important tool to implant favorable thoughts about which will ensure more cooperation from the people that live on the peice of land that the government has brought under control, and minimizes the need for the more exspencive police enforcement and very costly imprisionment of those who do not conform.,