But in the US, parole officers see their role to add additional punishment through threats and inserting petty and vindictive 'rules' into the lives of released prisoners in order to reinforce their authority and express the displeasure of the authorities. There are countless examples of people being returned to prison for trivial and even made up violations of parole - remember private prison is big business in America with lots of money to be made from returning people to prison (and sending them there in the first place).
Other countries see parole officers tasked with helping ex-prisoners return to society and keeping them out of trouble through support and assistance. Often parole officers are social workers or psychologists specializing in dealing with ex-offenders. A return to prison is seen as a failure of the parole officer rather than of the prisoner.