Thinking about it, what if Divine Departure is a technique created by the D clan? D could stand for Divine, and the Devil Fruits are an attempt by Imu and his kind to replicate that level of power, an additional extension of Imu's/his clan's will gone out of control. They're not only dangerous because they make you vulnerable to water, but because they make you vulnerable to being controlled by Imu and/or the 5 Elders, since they're all extensions of one source of will, something which only Ds and/or people with CoC are proficient at defending against.