First off, this is absolutely awful to hear. I had no idea of this rampant issue in your country and I am very appalled and heartbroken for the victims.
Your question, however, is whether your government is right in banning pornography. I understand what the government is attempting to do here, I believe if you look in the past of some of these rapists you will find pornography. However, that is not the root issue. The true answer? I would wonder what home life is like. Are families encouraged or are parents split apart? Is child abuse common? What conditions did these rapists grow up in. Also, as a Christian, I believe that Jesus Christ is the answer to any solution. On a more technical level, however, I believe the government needs to work on making violators of the law pay for their injustice and then go from there.
RE: Is banning porn really the solution for flaming RAPE cases in Nepal?