Quote: It's not usually something that they do, since guns aren't a disease.
Wrong. The CDC performed gun studies until the mid-1990s when Congress started targeting their funding specifically to prevent them from doing further gun studies.
They cut down on them using PUBLIC funding! But clearly if Obama can commission them to do a study, then they can still perform some studies. And while they did indeed find that guns are bad, they also found that they're more likely to be used for defensive purposes.