"The world has changed a lot since the 70s." True. These two teens, and their Mom and Dad, are to be commended for supporting RKBA in a less than friendly atmosphere given the negative press attached to fire arms.
Rather than "drawing attention to themselves" as someone in the article was quoted as saying, I see them drawing attention to a right all of us are entitled to.
Hats off to 'em! If I were fortunate enough to live in an open carry state, I would do the same.