While their is no "cure" per se, sex offenders can definitely be rehabilitated. I think you mistakenly thought that the two words meant the same, when they are completely different.
Believe it or not, when sex offenders are cleared of their criminal record and have more employment opportunities, there is a decreased probability that they will re-offend as opposed to being unemployed.
Furthermore, you failed to mention some very important statistics. Only 0.2% are granted to sex offenders, 97% of offenders granted pardons are successful in not re-offending and only 3% of pardons are revoked.