I can't really argue with this one but it's not really about carrying guns. I have seen a pistol brought out at a little league baseball game and I know last year two friends got in a fight over a bet on a college football game and one killed the other. I understand the point you are making but sometimes the reality of it is true.If people carry guns, there will be murders over parking spaces and neighborhood basketball games.
People do get killed over parking spaces and neighborhood games but banning guns won't help that a lot.