You can't just command someone to do something and not explain why, otherwise, obviously, they're not going to follow the command.
The argument would be for the purpose of convincing me that the command has any merit, right? After all, I'm not employed by the guy who made the command and he's not a government officer, so why should I listen?
You can absolutely do that, just like you can also propose arguments that fail to persuade. I'm not claiming it's an effective way to spend one's time.
