David wasn't thinking of being king when he was tending sheep; he was just doing what God sat before him.
I'm always a big fan of if you approach somebody politely about something and you're not a nudge - you're just pretty honest and simple, my kind of philosophy is that I'm not afraid of 'no,' and that's way different than 'I won't take no for an answer.'
People are, well, only human. We know that. The rule of law is borne out in identifying, condemning, and punishing those who violate the standards on which we all agree. This is exactly what we do in America.