I say this often, THINK. There is something in life called common sense. Webster's says common sense is sound and prudent judgment based on a simple perception of the situation or facts. Perhaps this is why in 1776, Thomas Paine used these words as a title for the most famous pamphlet ever written.
An opponent is entitled to the same regard for his principles as we would expect others to have for ours. Non-violence demands that we should see every opportunity to win over opponents.