What are the advantages of having a diploma of justice or a bachelor of criminology for the police?

Yes of course, any bachelor degree will bring you up a higher rank than others. People in the same field all think differently about you and would respect you more because of the knowledge that you have. It also brings out courage because if you have a greater mind in a certain field than anyone else in the field, of course you can overrun them. However people would respect you and stay under your command if you treat them by respect and not using you feelings. Successful policemen's and investigators do not involve their own feelings or ever think of having revenge.