That's true, it's most always the owners. The people in NZ most likely, as far as I am aware, to own pitbulls are gang members who train them to fight. It's sad to see all pitbulls getting tainted with the same brush.
When I worked for the Humane Society, pit bulls were actually the tenth (my memory may be off, but it was somewhere around there) most agressive breed. Everyone pegs them as being the first most agressive breed, it's not true. Pit bulls are big sucks and very lovable. I adore pit bulls. Unfortunately there are idiot pitbull owners out there giving these dogs a bad name. Pit bulls are abused horribly as owners try to train them to be vicious. It's so sad.