Hmmm, I don't know about magic being benign and only recently turning violent

Maybe it's because I wasn't watching kids shows as much as I was reading the lord of the rings, getting into greek mythology and european fairy tales, but if you ask me, magic has always had it's dark and powerful sides. Although that's just my humble opinion
Having said that, I have to agree that such violent, destructive magic is no fun at all. Whenever I am faced with the question what element I would choose if I suddenly got the power to control them like the benders in the Avatar cartoons, I'm always torn between water and air (all the while thinking which could be more usefull/fun when it comes to mundane everyday things), while most of my friends instantly go for fire.
I always ask them why? Why would they go for such a "useless", if admittedly very cool, element? You could only do flashy light shows and destroy things, but that's it. No real useful magic in your day to day life.