Sad to say, but in a way it is good the mortality rate is so high. It dies off before it can spread far.
Indeed. In general, the more deadly a disease is, the more likely it is to kill off its victims before it spreads far.
I will not discuss the details, but in Africa, one of the ways that Ebola spreads is through the way they prepare bodies for funerals. Another is that they will eat dead animals that they find. So this disease actually gets some help to spread.