That doesn't work:
- Once upon a time, the lawful government of a powerful country tried to kill all the members of an upstart religious group that was worshipping some guy who (they claimed at least) the government executed for high treason. That upstart religious group is now the most popular and most powerful religion in the world.
- Once upon a time, the lawful government of a powerful country tried to kill everyone who believed that citizens should be equal. That government was overthrown.
- Once upon a time, the lawful government of a powerful country put down a major rebellion of almost 1/3 of the country by force over the course of about 5 years of fighting. 150 years later, there are still thousands of people who think that the rebels were right, and the symbols of that rebellion are still frequently seen, most commonly in the area where the rebellion started.
I could go on, but I think you get the point.