Honestly, plenty of well intentioned people don't know that the second amendment is there for the reason it is. They figure that hey, I see no reason to own a 30 round semi auto rifle, and they are surrounded by Fudds who parrot all the drivel about how 'pure' the sport of hunting was way back before the newfangled automatics came out. They have to condemn semi autos to align with these old geezers, who are not bad guys either. But they moan, and talk crap, complaining about things, claiming they 'never took more than one shot to put a deer down, can't imagine why these kids would need it'.
My dad was this way, until he came around a few years ago. It's very difficult to reach these people, and show them the truth. They have been indoctrinated their whole lives to believe that the second amendment is there for hunting.