>>>>You can have gun laws (background checks and registration) implemented in just a few months and start seeing results quickly.
>>>
>>>SNIP
>>>
>>>What results would you expect to see?
>>
>>In one year I would expect to see minimal change, so you'd better revamp it to restrict more potential buyers. In another year when the projected results aren't achieved you'd probably have to tweak it again to limit the types of guns that are available for purchase. That didn't work? Those semi-auto rifles and shotguns must be the culprit. That didn't work either? Well, it would be too politically damaging to revert to the way it was, so let's just move the goalposts to make it look like we accomplished something.
>
>I don't see any problem with limiting semi-automatics. Unless you can explain why they have any useful purpose.

You might as well say "I don't see any problem with limiting all guns" since the vast majority of handguns and shotguns are semi-auto.

Please define "useful" and explain the "usefulness" of owning a particular type of car.

Here are 3 "useful" uses for our 2nd Amendment right : protection, sport, stress relief. Protection is self explanatory. I assume you understand the usefulness of sport since you are a fan of many. As for stress relief, http://www.apa.org/monitor/2011/01/stressed-america.aspx.

Mind you, this excercize is not meant as acknowledgment for your suggestion that rights need to be justified, but rather to volley the ball back to your court to see what you come up with.