Not a problem, thanks for asking. I wish more folks would be willing to ask questions rather than make blatant assumptions.
In some areas it's a more pressing need than in others. I personally doubt I'll ever be put in the situation. Others may feel differently, especially in more urban areas.
Full auto rifles manufactured after 1986 are already banned, and those made before the date are extremely rare, extremely expensive, and require ATF certification to own. The 'need' argument is petty, but I personally don't have a use for one. It'd be fun as hell though.
Easily 50% of my family's food comes from hunting. Hogs are invasive, saves us money, and it's delicious. It would have a huge impact on me both economically and personally.
America practically has its own terrorist society in the form of gangs. Easily 90% of crime in america is gang related, and a lot of these gangs have international ties south of the border. This is no simple topic, and we could spend days discussing the ins and outs of organized crime and what provokes it, but that's not the point of this discussion.
It's definitely going to go back and forth, just like anything else has that's been threatened legally. Drugs, alcohol, firearms, tobacco, and anything else remotely questionable have all had their legality altered and regulated in many different ways over the years.
I love my semi-automatics for hog hunting purposes (As they travel in groups), but I'm not one to talk about the magazine debate. For practical reasons, I prefer the lower-capacity magazines. They're more streamlined with the gun, less likely to get snagged on clothing or brush, and allow me to hold the rifle in a more comfortable way. As for pistol grips and stocks, those are purely a matter of personal preference that don't lend anything to the rifle's practicality. People have different physical builds and ergonomic needs, that's about it.
Did they specifically envision repeating weapons? Maybe, maybe not. That's irrelevant, and so is the argument. Laws should be made on a case by case basis, and this doesn't always mean adhering to a specific creed. That said, in this specific instance, that creed just so happens to have the right idea.