Q. What if you see the necessity for a violent act in order ultimately to do good for another person?

A. You just do it

Q. But if you are not at that point of true compassion and wisdom?

A. You do not question or worry about your wisdom. You just do whatever is required. The situation you are facing is itself profound enough to be regarded as knowledge. You do not need secondary resources of information. You do not need reinforcement or guidelines for action. Reinforcement is provided by the situation automatically.  When things must be conducted in a tough manner, you just do it because the situation demands your response. You do not impose toughness; you are an instrument of the situation.

Chogyam Trungpa - Cutting Through Spiritual Materialism