Hopefully nothing bad comes from this. In court the father said: "What if he comes back? What if he tries to hurt us, or our daughter? What if he loses his job and has nothing else to lose?". I bet this family is going to be looking over their shoulders for a long time.
How is being a US Marshall a mitigating factor? If anything that makes it all the more important for a guy granted special power by the State to be held accountable since he poses an especially great threat.