When you are as corrupt as Sheriff Elder is, you have a lot of skeletons in the closet. So you groom your prodigy to one day take over and keep that closet door shut. Roybal has been groomed by Elder to do just that. He has been handed position after position throughout the office, without having to interview against far more qualified candidates, just so he could pad his resume. A vote for Roybal is a vote for continued corruption.