Just read an interesting article about a comprehensive study of the effects of gun laws on violent crime.
Basically, it says that there is insufficient evidence to show that bans of certain guns, waiting periods, etc have any effect on decreasing gun violence/crimes.
Personally, I think that this shows that we need to do more research into what legislation (or pieces of legislation) can affect change in gun crimes, accidental shootings, etc before we implement any more changes.
Logically, it just seems completely backwards to pass laws without any statistically significant supporting evidence as to their impact.
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http://www.cdc.gov/mmwr/preview/mmwrhtml/rr5214a2.htm>