The funeral parlor was a large operation. They processed dozens of bodies every week for final resting places. Some were cremated and didn't need the heavy duty cosmetic work to make them look presentable. Sometimes the dirty and hard work had certain benefits when pretty young female corpses were stretched out on top of the metal tables like slabs of meat ready for a night worker with a yen for the ultimate submissiveness possible.
Brother Thomas was dedicated to the service of the almighty. He is willing to do anything necessary to put the sinners on the right track to salvation no matter how unpleasant the "closet penance" needed to solve their issues of penance and proper contrition.
He lost his beloved sister, the only person he ever loved or who loved him, followed by both of his parents. He rightly blames the District Attorney, and the drugged out vagrant bums who killed her and then were allowed to go free. With no reason to suppress his inner demons, he seeks revenge on the guilty.