The fundamental

purpose of our art, fighting for survival, cannot be ignored or overlooked. Indeed, to do so would be to prostitute it. But the potential for misuse of the capability for violence of Kung Fu requires that we use it as a last, rather than a first, resort. Any other course also prostitutes the art. It is for use when we or others are under threat of violence, not as a means to intimidate or coerce others.
Proper training provides us with means for the reduction of stress through physical activity, and breathing and meditation exercises. We learn to deal with combat, fear, aggression and pain in a controlled environment, and develop discipline and tolerance.
So most martial arts, with Kung Fu being no exception, involve discipline and attempt to instil their devotees with a grounding in the traditions and related philosophies of the art.
In the case of Kung Fu and Wing Chun, we must look more closely at the underpinning philosophies of Chinese culture, starting with the teachings of Taoism, Confucianism and Buddhism.