There isn't just one answer to that question. It really depends on each person's journey. It can depend on the risk factors and the wherewithal each person already has to protect themselves.
Some victims are able to recover and move on, while others suffer the effects their entire lives. Some people experience post-traumatic growth in a very positive way and even come out better for having gone through what they did, although it may sound odd to say. There isn't a single answer I can give you.
I do want to make a point, though.
Earlier, we talked about children who witness violence and the victims. Children aren't witnesses. They are full-fledged victims of the violence being perpetrated. They aren't merely witnesses to the violence. Even if the violence isn't directed at them, they live in a climate of violence and they are victims who are directly affected.