My off the wall opinion...
Rifle style weapons with high capacity mags are fun hobbies for the average owner. There are very few situations where they would grab an M16 over a handgun for home defense. On the other hand if a group were to say... rise against the government... these would be the type of weapons they would choose when defending their rights. At a time when people are very open about not liking the government, they are aware the people are armed. Every post on the internet about hating the government, and rising up against them cant be helping your chances of reaching the outcome you want. If I knew I could be the target of a civil war at some point I would want to disarm as many people as I could on the other side. You may think its fun to talk about hating Obama and loving your guns enough to go to jail/die for them.. but you may be causing your own problems.