It was remailed automatically by anonymizing remailer software. Two people each kill an entire family, mangling their bodies beyond recognition. One did it volitionally, driving a car into a family crowd in an act of premeditated revenge, a textbook case of murder. The second did it unintentionally when a bit of road debris caused a blowout and resulted in a horrible highway accident. The first can and should be prosecuted, the second not.
Intent is everything.
The first is a drug dealer who doesn't report his earnings. The second is a hospitalized person, unconscious in a coma. The first, if discovered, may be prosecuted, the second, not. Perhaps neither should be, but intent is the yardstick of criminality.