Also, say the title is not misleading and they publish the results and some crazy dictator gets his hands on it. First, he has to be crazy enough to want to develop a virus that has a 50% chance of killing him. Then he has to find scientists that are willing to develop the virus that has a 50% chance of killing them and their family and friends, etc. The likelihood of all these things transpiring seems relatively low.
On the other hand, this research seems to indicate that it's not wholly unlikely that this kind of virus mutation could transpire organically, in which case this "recipe" being public knowledge would be instrumental in fighting the disease. Even if it doesn't arise organically (crazy terrorist convinces crazy scientists) the public knowledge of it would still reduce the 50% death rate.
And I also feel that the kind of sentiments that lead people to claim that this research should never have been performed in the first place are misguided. This kind of tinkering and hacking around is likely what would lead to the next big cure, etc. Never stop scientists from learning new things.