Even if people basically understand this concept, some of them will still rationalize granting the government an exception from morality:
But these are the rules for the common people. We need some elite to have a special authority. We just have to find the right people and they won't abuse their power!
It's good to remind some basic moral rules from time to time, but changing the attitude mentioned above will be the hard part.
That's going to be the single hardest thing any of us ever do. The vast majority of people on this Earth have this deep-seated, ingrained notion that some people are exempt from moral rules that everyone else must adhere to.
But it's a fight worth fighting. :D