Mostly because us not developing these kinds of viruses doesn't mean it won't exist via scientists in other countries or evolution via commercial practices.

This isn't a natural virus, its a genetically engineered one. 

So we (a) create a deadly virus that didn't exist, then (b) claim victory when we develop a vaccine that is ~35% effective against it? 

Sounds fairly insane. 


freetx

If we don't study it, we will have a hard time stopping it.  Maybe we should study it in computer models instead of mice.