He is made to comply because his charges have to be read...his finger prints need to be done and he needs to be searched. The main reason is to get the job done so they can move onto the next prisoner. Sometimes the bi-product is safety but basically they are made to comply because there are proceedures that need to be put in place and if a crim refuses to do what he is told - he is made to.
I don't know what else to tell you. These are the facts from someone who works in the industry. There is nothing else I can say without risking repeating myself. Restraint and compliance are the two reasons they use pain compliance techniques. These are facts.