Even though World War II has been over for fifty years now, the crimes that were determined during the Nuremberg trials are in the "Crimes against humanity" category. These charges do not simply fade away over time, they stay with you forever. It is well known that German officials are very strict about this and are cleaning up their reputation by arresting all the Nazi criminals.
We should still prosecute against crimes that were committed during the Holocaust. Even though these were done more than 70 years ago, the acts were brutal. Therefore, there should be a lesson that no one is above the law, and you will be prosecuted no matter how much times passes.
No, I don't feel that it would fit in with the healing process for the world. It's never a good idea to answer violence with more violence. It's always important to remember the terrible events that occurred during that time period, but holding onto the hurt and sadness won't fix what happened in the past.
No, we should not still be prosecuting crimes that were committed during the Holocaust. People committing crimes at that time were most probably forced to and are very old at this point in time. Focus should be put more on crimes occurring more recently than way back then, especially since court is a long process.