the fbi are no better than the pedos.  there have been incidences where they have admitted to sharing real cp that wasn't previously in circulation in sting operations. australian police in cooperation with the fbi ran one of the largest cp forums in the world for months to catch as many pedos as possible.  you could argue for the benefits of these tactics based on a utilitarian point of view but you have to remember real children were abused during the time they operated these websites.
Australia