I think the biggest part of it is just the system. The C's system, which makes them incredibly efficient, and nearly unstoppable when they are executing, also promotes a lot of turnovers, simply because the ball is in the air a lot. For teams that use much more of an ISO system, it is easier to hold on to the ball, because they just don't pass as much. But the C's pass the ball a ton, which means there is a lot more room for error...but there is also a lot more room for success.
I think they can all improve on being more careful with the ball, but overall, I think the turnovers are just part of the price you pay for a ball movement offense.