With the correct attitude, the skilled martial artist will respect his own abilities. He will fear what harm he can do and this will help to keep his anger and aggression contained and not have them inflame a situation. If someone learns the martial arts only because he wants to fight he is destroying the very essence of the martial arts. He can expect disaster. These are the reasons for why martial arts teachers warn their students not to use what they learn without due cause.
Control means a measured response and a respect for limits.
In the spirit of Chan, I'd be more then happy to answer any questions you may have.