With regard to your earlier tactic, I think it will fail on the listener. It requires the listener to have a pre-existing agreement that police and citizens are equal.
Perhaps if you begin by explaining that the police are bound to laws, just as we are, the conversation might have a better start.
Can officers murder? No.
Can officers embezzle? No.
Can officers assault someone? No.
Can an officer speed? No.
And, with those last two, the person will realize or mention, "Well, if they're on duty, there are exemptions." And surely there are -- the exemptions are built into those laws; however, as proved by the first two examples, exemptions aren't universal across the Criminal Code.
The laws are meant to be equally applied to those whom they affect and are not exempt. Again, I know that we
know this, but I'd love for the layperson to understand it.