I think you're living in techno-fantasy land. "Deleting" people on a database achieves nothing. Look at how authoritarian governments actually work in the real world. An authoritarian government would simply arrest the leader of the opposition on made up charges, and then they would throw them in the jail. They don't have to go after everybody who disagrees with the government. They just go after a few of them, and this is more than enough to discourage the rest.