You could also experience guilt, as you couldn't prevent the abuse to happen. You might feel guilty because you didn't know what was going on or didn't recognize the warning signs. Some times it is guilt what makes you feel like you owe the survivor something because you couldn't protect him/her on time. 
​After a friend or family member learned that a child they know has been sexually abused, blame can be felt in many ways—toward the person who perpetrated, others who didn’t take action, barriers within the justice system, and even toward the child. Most often, however, parents of kids who have been abused blame themselves: “How could I let this happen?”, “I should have known better than to trust that person.”
Remember that it is always important to talk about your feelings with a professional, so you can learn to manage them. 

If you want to read more about this, visit: 
https://defendinnocence.org/how-to-manage-blame-after-your-child-has-been-sexually-abused/
​​