Doesn’t Ebola cause mental confusion? How could you prove that he had a rational through in his head other than “I must get to my sister?”
After Mr. Duncan came into direct contact with a late stage Ebola victim he had two choices - stay in Liberia and die in a matter of days or skedaddle to Dallas for treatment. He made a rational choice for himself at the expense of the residents of Dallas.
The “system” should prevent this sort of reckless transmission of a deadly disease.