Because that's not the story Ewing seems to be telling or want to tell? At least not yet. He might go crazy and off the rails later on tough...so that could happen.
@Mercury, you may want to not always look at these current stories through your personal lense of the trauma and abuse, they've seemingly suffered in the past. As far as the writers are concerned, specifically Ewing in this instance, their intent for these characters may not be hinged on the amount of abuse they've suffered in the past under previous writers decades ago. Just saying.