It is said that Bruce Lee was killed because he exposed the secrets of the Chinese martial arts to Westerners. However, they might not have had to kill him because the Chinese marial arts are tailered to the body and the characteristics of the Oriental people. Westerners can not become stronger in oriental martial arts as the Orientals can not become stronger in western boxing.
For example, boxing punches are these that a Western person with strong shoulders and long arms applies centrifugal force and strikes at the face, whereas Oriental martial arts punches are those that an Oriental person with small shoulders and short arms executes with instant power and pierces the target at one point. A long arm has stronger centrifugal force, but short arm ha faster speed. So it is good to get strong in a way that suits you.