My favorite passage from MLK's letter was when he said, "We know through painful experience that freedom is never voluntarily given by the oppressor; it must be demanded by the oppressed. Frankly, I have yet to engage in a direct-action campaign that was "well-timed" in the view of those who have not suffered unduly from the disease of segregation." I like this quote because it reminds people that there is not always an ideal time for some necessary actions.
I think that there would be more peace if people tried to use a little more empathy when viewing a conflict. Just take that extra few moments to try to imagine the situation from the other person's point of view. You will probably still get angry with people who are blatantly wrong, but you may be less upset with people who have a legitimate argument.