“Moses spoke [the priestly laws] to Aaron and to his sons and to all the people of Israel.”
~ Leviticus 21:24
Although Judaism considers everyone equally holy, our spiritual-leaders – the priests – are directed to live an especially spiritual life.
But why teach priest-specific laws to everybody, when they’re not relevant for most?
In order to make everybody responsible for ensuring that the priests follow them correctly.
In the same way leaders must hold themselves accountable in their roles, the people must hold their leaders accountable.
Just as you wouldn’t drink and drive yourself, don’t allow the bus-driver to drive drunk either.