Most likely one of two scenarios... either he is a rabid anti that is attempting to discredit gun owners by posing as one and acting like a complete idiot or he is about as dense as a lead brick.
That said... I hope this doesnt lead to new laws that restrict the open carrying of a rifle. At this point I am hard pressed to know of any place someone would consider carrying a rifle "reasonable" other than the woods... and the only "reasonable" rifle there would probably be a low round count bolt action.... or perhaps a blackpowder flintlock... Be careful with your condemnation... be very careful.
BTW, toroop's previous posts have made some believe he is a closet anti-gun advocate... his comments about this guy being his hero are on par for those comments.