In addition to the original betrayal, many survivors are then betrayed a second time when they are not believed or the abuse is minimized. When the people who should be protecting them refuse to see what is happening or refuse to believe that person that they trust would do such a thing, the child is betrayed by a second person, or a third, fourth, etc. Add in the fact that while these extra betrayals are happening it is also unlikely that the child is getting any assistance that could help alleviate PTSD with early interventions.
In short, the more betrayal, the more suffering. We all have a responsibility to, at the very least, not add to the betrayal.