Sheriff Schultz is the stronghold of law and order in Silverton. The Sheriff's story is a story of accepting that all means are good to keep the law above all. The older Schultz got, the better he understood that the world required decisive action from him and it would not be possible to take it while keeping his hands clean.
His goal is to maintain order in Silverton, and Schultz is ready to use all means available to achieve it. You are about to become a trustworthy helper to him. After all, besides the 'doing the good deeds' part, the Sheriff is more than capable to pay you well.