Answer:
Yes
Explanation:
Police officers have to go through exstensive training in a poloce academy. A teacher needs education degree in college and teachers liscense. Firefighters need to take a test and do a lot of training. Custodians need to do an Apprentishship for their jobs. so yes all them need to be qualified for their job.
According to Freud, this is Reaction Formation.
Another example can serve men that are prejudice against homosexuals are actually making a defense against their own homosexual feelings.