What I'm seeing here is that guns are dangerous when the person holding it isn't properly trained in how and when to use it.
It's worth noting that of those 30,000 deaths, about 17,000 are suicide. While they're regrettable, they're also matched by an similar number of non-firearm suicides. Clearly, the suicide problem isn't going to be solved by taking away guns. This is not to dismiss these deaths, just to say that blaming them on guns is rather silly.
In the same year I'm examining, accidental firearm deaths ran at about 600. Again, terrible, but accidental deaths by fire was about 5 times higher, and a great deal of these are cause by improperly trained children dealing with their last live fire drill. Personally, I'm not interested in talking about adults foolish enough to fall asleep while smoking of a bed or couch.
Now, let's talk about homicide. This brings us to about 13,000 per year by firearm. Cut/pierce homicides (stabbing fatalities) run about 2,000 per year, or about 1/6 relative to shootings. I'd say that gun control could probably bring the overall number of homicides down, but not by 13,000. How much is hard to say. As much as it's hard to say how much crime and/or gun deaths would go down if everyone was properly trained with a firearm and could be expected to carry at all times.
I personally don't have any firearms, and would only buy them for hunting (long guns, naturally). I also don't have a problem with properly trained people owning them. Personally, with the freedoms purportedly enjoyed in the US, I think it behooves a great number of the population to not only own guns, but take significant training in their use.
Source for above.