A couple things to interject.
Rob made a comment about Washington Voters taking the initiative process. "We" did and it was horrible. It made legal gun owners criminals. If you had a large family, and let's say you wanted to cut out of school early and go hunting with your uncle, you already can't bring you gun to school, and now he can't pick yours up for you, and nor can you borrow one of his guns. Both of those require you to go through a licenses FFL for a transfer. The bill was written by people who don't own guns. And the media mass blitzed the benefits of the legislation (attempting to prevent person to person sales without an FFL and a background check involved), while no one mentioned all the drawbacks. Hell, my parents voted for it because they didn't read through the entire bill only to find out the they would likely be breaking the law every year in one form or another. The initiative process has a good heart, but seems to always produce flawed legislation that often needs to be corrected in the legislature, since may or may not happen. The point is, avoid Initiative process on gun control, well thought out compromise is better than people who have no idea what it means to own a gun writing the rules.
Second, this topic stayed very productive and moderate (in terms of putting down others) until a couple of people, two in particular, one on each side of the debate, came in a started telling people the were hypocrites or just needed more GOD. Neither of those are facts and both need to tone it down. This is one of the better discussions I been a part of on the subject and we need to keep it out of the weeds.
Lastly, one of the ideas floating around in my head is that, like several have expressed on here, taking the guns away from people who want to do harm will not stop them. And are ARs (or any gun) really the worse thing they could be using to inflict damage? I think a gun often does a lot less damage than a bomb. While it takes more time and effort to plan out a bombing that an shooting (you don't have to make anything), some of these bad hombres appear to have thought it out for a long time. I also remember talking to a Canadian couple living in Hondurous who, when asked how nice it must be to live in a country where the criminals don't have guns, responded "They still have machetes".