Many martial arts have an underlying philosophy and basis of peace, reconciliation, and harmony. Equally, though, many are violent and use force and aggression to achieve those aims. While the bases of many martial arts are peaceful, the means to achieve that peace are anything but.
This is a deep contradiction – that ultimately actually makes sense. For many martial arts, this contradiction is comparable to Yin and Yang, in that two opposing ideas and concepts are needed to fulfil and complement each other, to create a sense of completeness and harmony. Many martial art disciplines seek to restore balance and harmony to the environment and restore the natural order of things. To seek that harmony and to return to peace and balance, violence is needed but must have peace and harmony at its core.