Resilience to violence in children :

Personal characteristics of the child (i.e. sense of self, mastery of tasks, sense of humor, security). Amazingly, there are children who seem to have a strong sense of self and are able to weather an enormous amount of violence in their lives by drawing on internal reserves and resources. These children seem to understand that the violence isn’t their fault, feel successful in various areas of their life (school, sports, friendships), and may have strong sense of racial or ethnic pride. High intelligence has also been associated with positive adaptation in the face of adversity.

Presence or absence of loving and supportive adults in their lives. The single most critical factor in how children weather exposure to domestic violence is the presence of at least one loving and supportive adult in their life.

I reckon it's appropriate if the kid is inherently resilient or if someone else is a loving and supporting adult in their life. Otherwise I wouldn't risk it. There's a fine line between soft paternalism and domestic violence.