I think a big reason for the resistance of acknowledging trauma as injury is, arguably, because culturally so many of us are injured that we behave in a clearly traumatized manner towards actions of healing, ie. rejection/denial/lashing out. If we acknowledged all forms of trauma as trauma we would have a radically different society…
After all, beating children into bruising was normal just a generation ago. In many states it’s still legal to beat your children.