That shows just how there is no institutional racism anymore. Even in this case, where the guy was elected to the position (and therefore could not easily be fired) the social pressure was strong enough to kick him out. That and the civil suit that the couple still filed, of course.
Will this guy remain a racist? Yes. Is there a way to ‘cure’ him? Should we send him to prison? No. He is just a stupid person and stupidity is a very common commodity in any place on earth.
What we do need to have is a society that legally punishes these people accordingly so the victims are not harmed. That system is already in place (albeit not perfectly) and that is a big deal.