The Equiis Pact isn't perfect, and neither are the Equestrians. Due to the massive size of the Pact there is places where they have to imply beuracy, which opens up corruption and it does exist, I just haven't found it relevant. Crime also exists, its just that bigger ones like rape and murder are less common. I will also reference the fact that when Robert blew up a EA data archive to start his terrorist attacks he was working with a Griffon, Equestrians are corruptible and can be evil, just less so. There does exist separate ideologies but they tend to be the minority, and gerrymandering has happened. Also for the other nations and why they would sacrifice there freedom to be in the Pact is that they don't actually loose much. They can still run there nations the way the choose, and they loose diplomatic power, but gain economic, miltiary, and protection.